CVE-2023-25725

CRITICALNVD 9.19.1
EchelonGraph scoreMEDIUM confidence

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

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2023-02-14. NVD baseline CVSS 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3

Also known asEUVD-2023-29633 (ENISA EUVD) · GHSA-h2p2-w857-329f (GitHub Security Advisories)Source: ENISA EUVD

9.1EG
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).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 5.5%CVSS: 9.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

HAProxy before 2.7.3 may allow a bypass of access control because HTTP/1 headers are inadvertently lost in some situations, aka "request smuggling." The HTTP header parsers in HAProxy may accept empty header field names, which could be used to truncate the list of HTTP headers and thus make some headers disappear after being parsed and processed for HTTP/1.0 and HTTP/1.1. For HTTP/2 and HTTP/3, the impact is limited because the headers disappear before being parsed and processed, as if they had not been sent by the client. The fixed versions are 2.7.3, 2.6.9, 2.5.12, 2.4.22, 2.2.29, and 2.0.31.

CVSS v3
9.1
EG Score
9.1CRITICALmedium confidence
EG Risk
58
EG Risk 58/100

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)
Severity91% × 45%
Impact severity (EG Severity): CVSS 9.1 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation5.5% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
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 none (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
5.5%
EPSS %ILE
92nd
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 (9.1): severity, escalated by confirmed exploitation. This CVE's 9.1 is its impact severity (EG Severity), not escalated.

EG Severity
9.1 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
5.5% 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 none (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

February 14, 2023

Last Modified

March 20, 2025

Advisory Details (5)

Auto-updated Aug 2, 2026
Patch available.
Web page

[SECURITY] Fedora 37 Update: haproxy-2.6.9-1.fc37 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JM5NCIBTHYDTLPY2UNC4HO2VAHHE6CJG/
Web page

[SECURITY] Fedora 36 Update: haproxy-2.4.22-2.fc36 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FPTJQHKUEU2PQ7RWFUYAFLAD4STEIKHU/
Web pageMentions a patch (unverified)

[SECURITY] [DLA 3318-1] haproxy security update

https://lists.debian.org/debian-lts-announce/2023/02/msg00012.html
Web page

HAProxy - The Reliable, High Perf. TCP/HTTP Load Balancer

https://www.haproxy.org/
Web page

[SECURITY] [DSA 5348-1] haproxy security update

https://www.debian.org/security/2023/dsa-5348

Patch Availability(9)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntuvim-haproxy (1.6.3-1ubuntu0.3+esm2) @ xenial2026-11-12ubuntu
ubuntuvim-haproxy (2.4.18-1ubuntu1.2) @ kinetic2026-11-12ubuntu
redhatrhceph/rhceph-haproxy-rhel8:2.2.19-322024-02-08redhat
redhathaproxy-0:2.2.24-3.rhaos4.13.el82023-05-18redhat
redhathaproxy-0:2.4.7-2.el9_0.22023-04-25redhat
redhathaproxy-0:2.2.19-4.el82023-04-12redhat
redhathaproxy-0:2.2.24-3.rhaos4.11.el82023-04-12redhat
redhathaproxy-0:2.4.17-3.el9_1.22023-04-11redhat
redhathaproxy-0:2.2.24-3.rhaos4.12.el82023-03-21redhat

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
haproxy1.8.19-1, 1.8.19-1+deb10u1, 1.8.19-1+deb10u2, 1.8.19-1+deb10u2~bpo9+1, 1.8.19-1+deb10u3
  • every version up to 1.8.19-1+deb10u4: fixed in 1.8.19-1+deb10u4
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
haproxy2.2.9-2 ... 2.2.9-2+deb11u3~bpo10+1 (7 versions)
  • every version up to 2.2.9-2+deb11u4: fixed in 2.2.9-2+deb11u4
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
haproxy—
  • every version up to 2.6.8-2: fixed in 2.6.8-2
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
haproxy—
  • every version up to 2.6.8-2: fixed in 2.6.8-2
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
haproxy—
  • every version up to 2.6.8-2: fixed in 2.6.8-2
—

Weakness Classification(1)

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

Additional Vendor Advisories

(4)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 21× in last 7d / 91× 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 320 rows on record for this CVE.

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. None are among the latest 100 rows. The 220 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-13 16:43 UTCEPSS rescoreEPSS 5.5% · 92nd percentile
  2. 2026-11-13 02:51 UTCEchelonGraph re-scored
  3. 2026-11-13 02:51 UTCVendor advisory
  4. 2026-11-13 02:51 UTCGHSA enrichmentGHSA-h2p2-w857-329f · GitHub severity CRITICAL · GitHub CVSS 9.1
  5. 2026-11-12 16:30 UTCEPSS rescoreEPSS 5.5% · 92nd percentile
  6. 2026-11-12 03:48 UTCEchelonGraph re-scored
  7. 2026-11-12 03:48 UTCVendor advisory
  8. 2026-11-12 03:48 UTCGHSA enrichmentGHSA-h2p2-w857-329f · GitHub severity CRITICAL · GitHub CVSS 9.1
  9. 2026-11-11 16:33 UTCEPSS rescoreEPSS 5.5% · 92nd percentile
  10. 2026-11-11 04:47 UTCEchelonGraph re-scored
  11. 2026-11-11 04:47 UTCVendor advisory
  12. 2026-11-11 04:47 UTCGHSA enrichmentGHSA-h2p2-w857-329f · GitHub severity CRITICAL · GitHub CVSS 9.1
  13. 2026-11-10 16:36 UTCEPSS rescoreEPSS 5.5% · 92nd percentile
  14. 2026-11-10 05:44 UTCEchelonGraph re-scored
  15. 2026-11-10 05:44 UTCVendor advisory
  16. 2026-11-10 05:44 UTCGHSA enrichmentGHSA-h2p2-w857-329f · GitHub severity CRITICAL · GitHub CVSS 9.1
  17. 2026-11-09 16:30 UTCEPSS rescoreEPSS 5.5% · 92nd percentile
  18. 2026-11-09 06:42 UTCEchelonGraph re-scored
  19. 2026-11-09 06:42 UTCVendor advisory
  20. 2026-11-09 06:42 UTCGHSA enrichmentGHSA-h2p2-w857-329f · GitHub severity CRITICAL · GitHub CVSS 9.1
  21. 2026-11-08 16:34 UTCEPSS rescoreEPSS 5.5% · 92nd percentile
  22. 2026-11-08 07:40 UTCEchelonGraph re-scored
  23. 2026-11-08 07:40 UTCVendor advisory
  24. 2026-11-08 07:40 UTCGHSA enrichmentGHSA-h2p2-w857-329f · GitHub severity CRITICAL · GitHub CVSS 9.1
  25. 2026-11-07 16:34 UTCEPSS rescoreEPSS 5.5% · 92nd percentile
Show 75 more
  1. 2026-11-07 08:38 UTCEchelonGraph re-scored
  2. 2026-11-07 08:38 UTCVendor advisory
  3. 2026-11-07 08:38 UTCGHSA enrichmentGHSA-h2p2-w857-329f · GitHub severity CRITICAL · GitHub CVSS 9.1
  4. 2026-11-06 16:31 UTCEPSS rescoreEPSS 5.5% · 92nd percentile
  5. 2026-11-06 09:37 UTCEchelonGraph re-scored
  6. 2026-11-06 09:37 UTCVendor advisory
  7. 2026-11-06 09:37 UTCGHSA enrichmentGHSA-h2p2-w857-329f · GitHub severity CRITICAL · GitHub CVSS 9.1
  8. 2026-11-05 16:32 UTCEPSS rescoreEPSS 5.5% · 92nd percentile
  9. 2026-11-05 10:36 UTCEchelonGraph re-scored
  10. 2026-11-05 10:36 UTCVendor advisory
  11. 2026-11-05 10:36 UTCGHSA enrichmentGHSA-h2p2-w857-329f · GitHub severity CRITICAL · GitHub CVSS 9.1
  12. 2026-11-04 16:31 UTCEPSS rescoreEPSS 5.5% · 92nd percentile
  13. 2026-11-04 11:34 UTCEchelonGraph re-scored
  14. 2026-11-04 11:34 UTCVendor advisory
  15. 2026-11-04 11:34 UTCGHSA enrichmentGHSA-h2p2-w857-329f · GitHub severity CRITICAL · GitHub CVSS 9.1
  16. 2026-11-04 11:25 UTCOSV refresh
  17. 2026-11-03 16:40 UTCEPSS rescoreEPSS 5.5% · 92nd percentile
  18. 2026-11-03 12:32 UTCEchelonGraph re-scored
  19. 2026-11-03 12:32 UTCVendor advisory
  20. 2026-11-03 12:32 UTCGHSA enrichmentGHSA-h2p2-w857-329f · GitHub severity CRITICAL · GitHub CVSS 9.1
  21. 2026-11-02 16:39 UTCEPSS rescoreEPSS 5.5% · 92nd percentile
  22. 2026-11-02 13:29 UTCEchelonGraph re-scored
  23. 2026-11-02 13:29 UTCVendor advisory
  24. 2026-11-02 13:29 UTCGHSA enrichmentGHSA-h2p2-w857-329f · GitHub severity CRITICAL · GitHub CVSS 9.1
  25. 2026-11-01 16:30 UTCEPSS rescoreEPSS 5.5% · 92nd percentile
  26. 2026-11-01 14:27 UTCEchelonGraph re-scored
  27. 2026-11-01 14:27 UTCVendor advisory
  28. 2026-11-01 14:27 UTCGHSA enrichmentGHSA-h2p2-w857-329f · GitHub severity CRITICAL · GitHub CVSS 9.1
  29. 2026-10-31 16:29 UTCEPSS rescoreEPSS 5.5% · 92nd percentile
  30. 2026-10-31 15:25 UTCEchelonGraph re-scored
  31. 2026-10-31 15:25 UTCVendor advisory
  32. 2026-10-31 15:25 UTCGHSA enrichmentGHSA-h2p2-w857-329f · GitHub severity CRITICAL · GitHub CVSS 9.1
  33. 2026-10-30 16:31 UTCEPSS rescoreEPSS 5.5% · 92nd percentile
  34. 2026-10-30 16:24 UTCVendor advisory
  35. 2026-10-30 16:24 UTCGHSA enrichmentGHSA-h2p2-w857-329f · GitHub severity CRITICAL · GitHub CVSS 9.1
  36. 2026-10-29 17:22 UTCEchelonGraph re-scored
  37. 2026-10-29 17:22 UTCVendor advisory
  38. 2026-10-29 17:22 UTCGHSA enrichmentGHSA-h2p2-w857-329f · GitHub severity CRITICAL · GitHub CVSS 9.1
  39. 2026-10-29 16:30 UTCEPSS rescoreEPSS 5.4% · 92nd percentile
  40. 2026-10-28 18:20 UTCEchelonGraph re-scored
  41. 2026-10-28 18:20 UTCVendor advisory
  42. 2026-10-28 18:20 UTCGHSA enrichmentGHSA-h2p2-w857-329f · GitHub severity CRITICAL · GitHub CVSS 9.1
  43. 2026-10-28 16:29 UTCEPSS rescoreEPSS 5.4% · 92nd percentile
  44. 2026-10-27 19:12 UTCEchelonGraph re-scored
  45. 2026-10-27 19:12 UTCVendor advisory
  46. 2026-10-27 19:12 UTCGHSA enrichmentGHSA-h2p2-w857-329f · GitHub severity CRITICAL · GitHub CVSS 9.1
  47. 2026-10-27 16:29 UTCEPSS rescoreEPSS 5.4% · 92nd percentile
  48. 2026-10-26 20:11 UTCEchelonGraph re-scored
  49. 2026-10-26 20:11 UTCVendor advisory
  50. 2026-10-26 20:11 UTCGHSA enrichmentGHSA-h2p2-w857-329f · GitHub severity CRITICAL · GitHub CVSS 9.1
  51. 2026-10-26 16:28 UTCEPSS rescoreEPSS 5.4% · 92nd percentile
  52. 2026-10-25 19:11 UTCVendor advisory
  53. 2026-10-25 19:10 UTCGHSA enrichmentGHSA-h2p2-w857-329f · GitHub severity CRITICAL · GitHub CVSS 9.1
  54. 2026-10-25 17:46 UTCEchelonGraph re-scored
  55. 2026-10-25 16:29 UTCEPSS rescoreEPSS 5.4% · 92nd percentile
  56. 2026-10-24 19:46 UTCEchelonGraph re-scored
  57. 2026-10-24 19:46 UTCVendor advisory
  58. 2026-10-24 19:45 UTCGHSA enrichmentGHSA-h2p2-w857-329f · GitHub severity CRITICAL · GitHub CVSS 9.1
  59. 2026-10-24 16:29 UTCEPSS rescoreEPSS 5.4% · 92nd percentile
  60. 2026-10-23 20:44 UTCEchelonGraph re-scored
  61. 2026-10-23 20:44 UTCVendor advisory
  62. 2026-10-23 20:43 UTCGHSA enrichmentGHSA-h2p2-w857-329f · GitHub severity CRITICAL · GitHub CVSS 9.1
  63. 2026-10-23 16:29 UTCEPSS rescoreEPSS 5.4% · 92nd percentile
  64. 2026-10-22 21:38 UTCEchelonGraph re-scored
  65. 2026-10-22 21:38 UTCVendor advisory
  66. 2026-10-22 21:38 UTCGHSA enrichmentGHSA-h2p2-w857-329f · GitHub severity CRITICAL · GitHub CVSS 9.1
  67. 2026-10-22 16:30 UTCEPSS rescoreEPSS 5.4% · 92nd percentile
  68. 2026-10-21 22:30 UTCEchelonGraph re-scored
  69. 2026-10-21 22:30 UTCVendor advisory
  70. 2026-10-21 22:30 UTCGHSA enrichmentGHSA-h2p2-w857-329f · GitHub severity CRITICAL · GitHub CVSS 9.1
  71. 2026-10-21 16:29 UTCEPSS rescoreEPSS 5.4% · 92nd percentile
  72. 2026-10-20 23:29 UTCEchelonGraph re-scored
  73. 2026-10-20 23:29 UTCVendor advisory
  74. 2026-10-20 23:29 UTCGHSA enrichmentGHSA-h2p2-w857-329f · GitHub severity CRITICAL · GitHub CVSS 9.1
  75. 2026-10-20 16:29 UTCEPSS rescoreEPSS 5.4% · 92nd percentile

Frequently asked(5)

What is CVE-2023-25725?
CVE-2023-25725 is a critical-severity vulnerability; its CVE record was published on February 14, 2023. HAProxy before 2.7.3 may allow a bypass of access control because HTTP/1 headers are inadvertently lost in some situations, aka "request smuggling." The HTTP header parsers in HAProxy may accept empty header field names, which could be used to truncate the list of HTTP headers and thus make some…
When was the CVE record for CVE-2023-25725 published?
The CVE record for CVE-2023-25725 was published on February 14, 2023. 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 March 20, 2025; the record at its source may have been updated since.
Is CVE-2023-25725 actively exploited?
CVE-2023-25725 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 5.5% probability of exploitation in the next 30 days (92nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2023-25725?
CVE-2023-25725 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2023-25725?
A fix for CVE-2023-25725 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2023-25725 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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