CVE-2022-31081

HIGHNVD 7.37.3
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This high-severity CVE scores 7.3 under NVD CVSS v3. EPSS exploit probability: 2.4% (83rd percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3
Elevated

Also known asEUVD-2022-52739 (ENISA EUVD)Source: ENISA EUVD

7.3EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 2.4%CVSS: 7.3Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

HTTP::Daemon is a simple http server class written in perl. Versions prior to 6.15 are subject to a vulnerability which could potentially be exploited to gain privileged access to APIs or poison intermediate caches. It is uncertain how large the risks are, most Perl based applications are served on top of Nginx or Apache, not on the HTTP::Daemon. This library is commonly used for local development and tests. Users are advised to update to resolve this issue. Users unable to upgrade may add additional request handling logic as a mitigation. After calling my $rqst = $conn->get_request() one could inspect the returned HTTP::Request object. Querying the 'Content-Length' (my $cl = $rqst->header('Content-Length')) will show any abnormalities that should be dealt with by a 400 response. Expected strings of 'Content-Length' SHOULD consist of either a single non-negative integer, or, a comma separated repetition of that number. (that is 42 or 42, 42, 42). Anything else MUST be rejected.

CVSS v3
7.3
EG Score
7.3HIGHmedium confidence
EG Risk
64
EG Risk 64/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity73% × 45%
Impact severity (EG Severity): CVSS 7.3 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
2.4%
EPSS %ILE
83rd
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (7.3): severity, escalated by confirmed exploitation. This CVE's 7.3 is its impact severity (EG Severity), not escalated.

EG Severity
7.3 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
EG Likelihood
2.4% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-12). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; 60 days if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

June 27, 2022

Last Modified

November 21, 2024

Advisory Details (10)

Auto-updated Nov 13, 2026
Patch available. Sources: github, github_commit.
Web page

[SECURITY] Fedora 37 Update: perl-HTTP-Daemon-6.16-1.fc37 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XQBW2D43TDNYX4R2YBTNNZDBNZ45DINN/
Web page

[SECURITY] Fedora 38 Update: perl-HTTP-Daemon-6.16-1.fc38 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ECJ4ZPBQWD3B2CD6RRIVMENB5KUOJ3LC/
Web page

[SECURITY] Fedora 36 Update: perl-HTTP-Daemon-6.16-1.fc36 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7U4XEPZ5Q3LNOQF3E6EXFWVSEXU5IZ6T/
Web pageMentions a patch (unverified)

[SECURITY] [DLA 3127-1] libhttp-daemon-perl security update

https://lists.debian.org/debian-lts-announce/2022/09/msg00038.html
GitHub advisoryMentions a patch (unverified)

Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling') in HTTP::Daemon · Advisory · libwww-perl/HTTP-Daemon · GitHub

https://github.com/libwww-perl/HTTP-Daemon/security/advisories/GHSA-cg8c-pxmv-w7cf
GitHub commit

commit e84475de51d6 (libwww-perl/HTTP-Daemon)

Fix landed in libwww-perl/HTTP-Daemon commit e84475de51d6 — awaiting tagged release

https://github.com/libwww-perl/HTTP-Daemon/commit/e84475de51d6fd7b29354a997413472a99db70b2
GitHub commit

commit 8dc5269d59e2 (libwww-perl/HTTP-Daemon)

Fix landed in libwww-perl/HTTP-Daemon commit 8dc5269d59e2 — awaiting tagged release

https://github.com/libwww-perl/HTTP-Daemon/commit/8dc5269d59e2d5d9eb1647d82c449ccd880f7fd0
Web page

RFC 7230 - Hypertext Transfer Protocol (HTTP/1.1): Message Syntax and Routing

https://datatracker.ietf.org/doc/html/rfc7230#section-9.5
Web page

CWE - CWE-444: Inconsistent Interpretation of HTTP Requests (5.0)

https://cwe.mitre.org/data/definitions/444.html

Patch Availability(2)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulibhttp-daemon-perl (6.13-1ubuntu0.1) @ jammy2026-10-29ubuntu
ubuntulibhttp-daemon-perl (6.01-1ubuntu0.16.04~esm1) @ xenial2026-10-29ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(5 across 5 ecosystems)
Debian:10(1)
PackageVulnerable rangeFix by version rangeDependents
libhttp-daemon-perl6.01-3
  • every version up to 6.01-3+deb10u1: fixed in 6.01-3+deb10u1
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
libhttp-daemon-perl6.12-1
  • every version up to 6.12-1+deb11u1: fixed in 6.12-1+deb11u1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
libhttp-daemon-perl—
  • every version up to 6.14-1.1: fixed in 6.14-1.1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
libhttp-daemon-perl—
  • every version up to 6.14-1.1: fixed in 6.14-1.1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
libhttp-daemon-perl—
  • every version up to 6.14-1.1: fixed in 6.14-1.1
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(2)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 7× in last 7d / 34× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed its CVE.org record (CNA or CISA ADP). An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

Showing the most recent 100 of 236 rows on record for this CVE, as 99 entries (1 repeat merged).

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 1 repeat row among the latest 100 is merged into the row it repeats. The 136 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-13 16:42 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  2. 2026-11-13 06:51 UTCEchelonGraph re-scored
  3. 2026-11-12 16:29 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
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  5. 2026-11-10 16:35 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
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  8. 2026-11-07 16:34 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  9. 2026-11-06 16:30 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  10. 2026-11-05 16:56 UTCEchelonGraph re-scored
  11. 2026-11-05 16:32 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  12. 2026-11-04 16:30 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  13. 2026-11-03 16:39 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  14. 2026-11-02 16:38 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  15. 2026-11-01 16:30 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  16. 2026-10-31 16:29 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  17. 2026-10-30 16:30 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  18. 2026-10-29 16:29 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  19. 2026-10-29 03:02 UTCEchelonGraph re-scored
  20. 2026-10-29 03:02 UTCVendor advisory
  21. 2026-10-29 01:25 UTCOSV refresh
  22. 2026-10-28 16:28 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  23. 2026-10-27 16:28 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  24. 2026-10-26 16:28 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  25. 2026-10-25 18:08 UTCEchelonGraph re-scored
Show 74 more
  1. 2026-10-25 16:29 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  2. 2026-10-24 16:29 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  3. 2026-10-23 16:28 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  4. 2026-10-22 16:30 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  5. 2026-10-21 16:28 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  6. 2026-10-21 07:20 UTCEchelonGraph re-scored
  7. 2026-10-21 07:20 UTCVendor advisory
  8. 2026-10-20 16:29 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  9. 2026-10-19 16:28 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  10. 2026-10-18 16:28 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  11. 2026-10-18 08:35 UTCEchelonGraph re-scored
  12. 2026-10-17 16:29 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  13. 2026-10-16 16:34 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  14. 2026-10-16 11:54 UTCOSV refresh
  15. 2026-10-15 16:28 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  16. 2026-10-14 16:29 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  17. 2026-10-13 16:29 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  18. 2026-10-12 18:54 UTCEchelonGraph re-scored
  19. 2026-10-12 16:30 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  20. 2026-10-11 23:19 UTCEchelonGraph re-scored
  21. 2026-10-11 13:44 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  22. 2026-10-10 19:56 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  23. 2026-10-09 20:04 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  24. 2026-10-08 16:40 UTCEPSS rescoreEPSS 2.3% · 83rd percentile
  25. 2026-10-07 23:45 UTCEPSS rescoreEPSS 2.3% · 83rd percentile
  26. 2026-10-06 15:14 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  27. 2026-10-05 17:40 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  28. 2026-10-04 23:19 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  29. 2026-10-03 14:23 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  30. 2026-10-02 16:23 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  31. 2026-09-30 15:55 UTCEchelonGraph re-scored
  32. 2026-09-30 15:00 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
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  34. 2026-09-28 13:48 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  35. 2026-09-27 13:42 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  36. 2026-09-26 15:54 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  37. 2026-09-26 00:22 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  38. 2026-09-24 18:46 UTCOSV refresh
  39. 2026-09-24 14:00 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  40. 2026-09-23 13:45 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  41. 2026-09-22 14:44 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  42. 2026-09-20 20:13 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  43. 2026-09-19 15:38 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  44. 2026-09-18 19:24 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  45. 2026-09-16 14:05 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  46. 2026-09-15 03:06 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  47. 2026-09-13 16:44 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  48. 2026-09-12 14:57 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  49. 2026-09-11 14:49 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  50. 2026-09-11 09:33 UTCEPSS rescoreEPSS 2.3% · 81st percentile
  51. 2026-09-08 21:57 UTCEPSS rescoreEPSS 2.3% · 81st percentile
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  53. 2026-09-06 13:45 UTCEPSS rescoreEPSS 2.3% · 81st percentile
  54. 2026-09-05 15:25 UTCEPSS rescoreEPSS 2.3% · 81st percentile
  55. 2026-09-05 10:48 UTCOSV refresh
  56. 2026-09-04 13:57 UTCEPSS rescoreEPSS 2.3% · 81st percentile
  57. 2026-09-04 05:04 UTCEPSS rescoreEPSS 2.3% · 81st percentile
  58. 2026-09-02 14:09 UTCEPSS rescoreEPSS 2.3% · 81st percentile
  59. 2026-09-01 13:51 UTCEPSS rescoreEPSS 2.3% · 81st percentile
  60. 2026-08-30 19:14 UTCEPSS rescoreEPSS 2.3% · 81st percentile
  61. 2026-08-30 01:19 UTCEPSS rescoreEPSS 2.3% · 81st percentile
  62. 2026-08-28 21:38 UTCEPSS rescoreEPSS 2.3% · 81st percentile
  63. 2026-08-27 14:22 UTCEPSS rescoreEPSS 2.3% · 81st percentile
  64. 2026-08-26 14:43 UTCEPSS rescoreEPSS 2.3% · 81st percentile
  65. 2026-08-25 13:46 UTCEPSS rescoreEPSS 2.3% · 81st percentile
  66. 2026-08-24 14:13 UTCEPSS rescoreEPSS 2.3% · 81st percentile
  67. 2026-08-23 00:16 UTCEPSS rescoreEPSS 2.3% · 81st percentile
  68. 2026-08-21 23:46 UTCEPSS rescoreEPSS 2.3% · 81st percentile
  69. 2026-08-20 22:52 UTCEPSS rescoreEPSS 2.1% · 80th percentile
  70. 2026-08-19 17:01 UTCEPSS rescoreEPSS 2.1% · 80th percentile
  71. 2026-08-18 20:41 UTCOSV refresh
  72. 2026-08-18 13:45 UTCEPSS rescoreEPSS 2.1% · 80th percentile
  73. 2026-08-17 13:44 UTCEPSS rescoreEPSS 2.1% · 80th percentile
  74. 2026-08-16 14:53 UTCEPSS rescoreEPSS 2.1% · 80th percentile

Frequently asked(5)

What is CVE-2022-31081?
CVE-2022-31081 is a high-severity vulnerability; its CVE record was published on June 27, 2022. HTTP::Daemon is a simple http server class written in perl. Versions prior to 6.15 are subject to a vulnerability which could potentially be exploited to gain privileged access to APIs or poison intermediate caches. It is uncertain how large the risks are, most Perl based applications are served on…
When was the CVE record for CVE-2022-31081 published?
The CVE record for CVE-2022-31081 was published on June 27, 2022. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of November 21, 2024; the record at its source may have been updated since.
Is CVE-2022-31081 actively exploited?
CVE-2022-31081 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.4% probability of exploitation in the next 30 days (83rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2022-31081?
CVE-2022-31081 has a CVSS v3 base score of 7.3 (NVD).
How do I remediate CVE-2022-31081?
A fix for CVE-2022-31081 is available: update to the fixed version the vendor names in its advisory.

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