CVE-2023-27582

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 2023-03-14. 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-2023-0863 (ENISA EUVD) · GHSA-4g76-w3xw-2x6w (GitHub Security Advisories) · GO-2023-1630 (OSV.dev)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: 1.0%CVSS: 9.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

maddy is a composable, all-in-one mail server. Starting with version 0.2.0 and prior to version 0.6.3, maddy allows a full authentication bypass if SASL authorization username is specified when using the PLAIN authentication mechanisms. Instead of validating the specified username, it is accepted as is after checking the credentials for the authentication username. maddy 0.6.3 includes the fix for the bug. There are no known workarounds.

CVSS v3
9.1
EG Score
9.1CRITICALmedium confidence
EG Risk
56
EG Risk 56/100

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.
Exploitation1.0% × 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 total (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
1.0%
EPSS %ILE
63rd
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
1.0% 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: 3 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 total (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)3 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 total (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

March 13, 2023

Last Modified

November 21, 2024

Advisory Details (4)

Auto-updated Jul 22, 2026
Patch available. Sources: github_commit, github_release, github.
GitHub advisoryMentions a patch (unverified)

Full authentication bypass if SASL authorization username is specified · Advisory · foxcpp/maddy · GitHub

https://github.com/foxcpp/maddy/security/advisories/GHSA-4g76-w3xw-2x6w
GitHub release Patch Available

maddy 0.6.3

Patch available: foxcpp/maddy v0.6.3

https://github.com/foxcpp/maddy/releases/tag/v0.6.3
GitHub commit

commit 9f58cb64b39c (foxcpp/maddy)

Fix landed in foxcpp/maddy commit 9f58cb64b39c — awaiting tagged release

https://github.com/foxcpp/maddy/commit/9f58cb64b39cdc01928ec463bdb198c4c2313a9c
GitHub commit

commit 55a91a37b712 (foxcpp/maddy)

Fix landed in foxcpp/maddy commit 55a91a37b712 — awaiting tagged release

https://github.com/foxcpp/maddy/commit/55a91a37b71210f34f98f4d327c30308fe24399a

Vendor Advisories for CVE-2023-27582(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
gogithub.com/foxcpp/maddy @ 0.6.3 (fixes >= 0.2.0, < 0.6.3)—ghsa

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

(3 across 3 ecosystems)
Alpine:v3.23(1)
PackageVulnerable rangeFix by version rangeDependents
maddy—
  • 0.2.0 up to 0.6.3-r0: fixed in 0.6.3-r0
—
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
maddy—
  • 0.2.0 up to 0.6.3-r0: fixed in 0.6.3-r0
—
Go(1)
PackageVulnerable rangeFix by version rangeDependents
github.com/foxcpp/maddy—
  • 0.2.0 up to 0.6.3: fixed in 0.6.3
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 14× in last 7d / 44× 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 267 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 167 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-13 16:44 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
  2. 2026-11-13 10:39 UTCEchelonGraph re-scored
  3. 2026-11-13 10:39 UTCGHSA enrichmentGHSA-4g76-w3xw-2x6w · GitHub severity CRITICAL · GitHub CVSS 9.1
  4. 2026-11-12 16:30 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
  5. 2026-11-12 08:37 UTCEchelonGraph re-scored
  6. 2026-11-12 08:36 UTCGHSA enrichmentGHSA-4g76-w3xw-2x6w · GitHub severity CRITICAL · GitHub CVSS 9.1
  7. 2026-11-11 16:33 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
  8. 2026-11-11 06:43 UTCEchelonGraph re-scored
  9. 2026-11-11 06:43 UTCGHSA enrichmentGHSA-4g76-w3xw-2x6w · GitHub severity CRITICAL · GitHub CVSS 9.1
  10. 2026-11-10 16:37 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
  11. 2026-11-10 04:50 UTCEchelonGraph re-scored
  12. 2026-11-10 04:50 UTCGHSA enrichmentGHSA-4g76-w3xw-2x6w · GitHub severity CRITICAL · GitHub CVSS 9.1
  13. 2026-11-09 16:30 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
  14. 2026-11-09 02:57 UTCEchelonGraph re-scored
  15. 2026-11-09 02:57 UTCGHSA enrichmentGHSA-4g76-w3xw-2x6w · GitHub severity CRITICAL · GitHub CVSS 9.1
  16. 2026-11-08 16:34 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
  17. 2026-11-08 01:05 UTCEchelonGraph re-scored
  18. 2026-11-08 01:05 UTCGHSA enrichmentGHSA-4g76-w3xw-2x6w · GitHub severity CRITICAL · GitHub CVSS 9.1
  19. 2026-11-07 16:34 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
  20. 2026-11-06 23:10 UTCEchelonGraph re-scored
  21. 2026-11-06 23:10 UTCGHSA enrichmentGHSA-4g76-w3xw-2x6w · GitHub severity CRITICAL · GitHub CVSS 9.1
  22. 2026-11-06 16:31 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
  23. 2026-11-05 21:17 UTCEchelonGraph re-scored
  24. 2026-11-05 21:17 UTCGHSA enrichmentGHSA-4g76-w3xw-2x6w · GitHub severity CRITICAL · GitHub CVSS 9.1
  25. 2026-11-05 16:33 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
Show 75 more
  1. 2026-11-04 19:24 UTCEchelonGraph re-scored
  2. 2026-11-04 19:24 UTCGHSA enrichmentGHSA-4g76-w3xw-2x6w · GitHub severity CRITICAL · GitHub CVSS 9.1
  3. 2026-11-04 16:31 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
  4. 2026-11-04 11:55 UTCOSV refresh
  5. 2026-11-03 17:31 UTCEchelonGraph re-scored
  6. 2026-11-03 17:31 UTCGHSA enrichmentGHSA-4g76-w3xw-2x6w · GitHub severity CRITICAL · GitHub CVSS 9.1
  7. 2026-11-03 16:40 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
  8. 2026-11-02 16:39 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
  9. 2026-11-02 15:38 UTCEchelonGraph re-scored
  10. 2026-11-02 15:38 UTCGHSA enrichmentGHSA-4g76-w3xw-2x6w · GitHub severity CRITICAL · GitHub CVSS 9.1
  11. 2026-11-01 16:30 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
  12. 2026-11-01 13:44 UTCGHSA enrichmentGHSA-4g76-w3xw-2x6w · GitHub severity CRITICAL · GitHub CVSS 9.1
  13. 2026-11-01 08:21 UTCGHSA enrichmentGHSA-4g76-w3xw-2x6w · GitHub severity CRITICAL · GitHub CVSS 9.1
  14. 2026-11-01 08:21 UTCEchelonGraph re-scored
  15. 2026-10-31 16:29 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
  16. 2026-10-31 11:51 UTCEchelonGraph re-scored
  17. 2026-10-30 16:31 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
  18. 2026-10-30 09:58 UTCEchelonGraph re-scored
  19. 2026-10-29 16:30 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
  20. 2026-10-29 08:05 UTCEchelonGraph re-scored
  21. 2026-10-28 16:29 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
  22. 2026-10-28 06:11 UTCEchelonGraph re-scored
  23. 2026-10-27 16:29 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
  24. 2026-10-27 04:18 UTCEchelonGraph re-scored
  25. 2026-10-26 16:28 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
  26. 2026-10-25 17:45 UTCEchelonGraph re-scored
  27. 2026-10-25 16:29 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
  28. 2026-10-24 20:06 UTCEchelonGraph re-scored
  29. 2026-10-24 16:29 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
  30. 2026-10-23 18:11 UTCEchelonGraph re-scored
  31. 2026-10-23 16:29 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
  32. 2026-10-22 16:31 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
  33. 2026-10-22 16:13 UTCEchelonGraph re-scored
  34. 2026-10-21 16:29 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
  35. 2026-10-21 14:05 UTCEchelonGraph re-scored
  36. 2026-10-20 16:29 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  37. 2026-10-20 12:13 UTCEchelonGraph re-scored
  38. 2026-10-19 16:29 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  39. 2026-10-19 10:18 UTCEchelonGraph re-scored
  40. 2026-10-18 16:29 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  41. 2026-10-18 07:18 UTCEchelonGraph re-scored
  42. 2026-10-17 16:29 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  43. 2026-10-17 05:23 UTCEchelonGraph re-scored
  44. 2026-10-16 16:35 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  45. 2026-10-16 03:29 UTCEchelonGraph re-scored
  46. 2026-10-15 16:29 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  47. 2026-10-15 00:13 UTCEchelonGraph re-scored
  48. 2026-10-14 16:29 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  49. 2026-10-13 20:12 UTCEchelonGraph re-scored
  50. 2026-10-13 16:29 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  51. 2026-10-12 17:20 UTCEchelonGraph re-scored
  52. 2026-10-12 16:30 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  53. 2026-10-11 21:56 UTCEchelonGraph re-scored
  54. 2026-10-11 13:45 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  55. 2026-10-10 19:57 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  56. 2026-10-09 20:05 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  57. 2026-10-08 17:06 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  58. 2026-10-07 23:45 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  59. 2026-10-06 15:15 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  60. 2026-10-05 17:41 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  61. 2026-10-04 23:20 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  62. 2026-10-03 14:23 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  63. 2026-10-02 16:23 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  64. 2026-10-01 19:47 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  65. 2026-09-30 16:20 UTCEchelonGraph re-scored
  66. 2026-09-30 15:01 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  67. 2026-09-29 15:16 UTCEPSS rescoreEPSS 1.0% · 61st percentile
  68. 2026-09-28 13:49 UTCEPSS rescoreEPSS 1.0% · 61st percentile
  69. 2026-09-27 13:42 UTCEPSS rescoreEPSS 1.0% · 61st percentile
  70. 2026-09-26 00:22 UTCEPSS rescoreEPSS 1.0% · 61st percentile
  71. 2026-09-24 14:01 UTCEPSS rescoreEPSS 1.0% · 61st percentile
  72. 2026-09-23 18:52 UTCOSV refresh
  73. 2026-09-23 13:45 UTCEPSS rescoreEPSS 1.0% · 61st percentile
  74. 2026-09-22 14:45 UTCEPSS rescoreEPSS 1.0% · 61st percentile
  75. 2026-09-20 20:14 UTCEPSS rescoreEPSS 1.0% · 61st percentile

Related CVEs(same product + same CWE)

Same product

3 shown

Alpine:v3.23:maddy · Go:github.com/foxcpp/maddy

Frequently asked(5)

What is CVE-2023-27582?
CVE-2023-27582 is a critical-severity vulnerability; its CVE record was published on March 13, 2023. maddy is a composable, all-in-one mail server. Starting with version 0.2.0 and prior to version 0.6.3, maddy allows a full authentication bypass if SASL authorization username is specified when using the PLAIN authentication mechanisms. Instead of validating the specified username, it is accepted…
When was the CVE record for CVE-2023-27582 published?
The CVE record for CVE-2023-27582 was published on March 13, 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 November 21, 2024; the record at its source may have been updated since.
Is CVE-2023-27582 actively exploited?
CVE-2023-27582 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.0% probability of exploitation in the next 30 days (63rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2023-27582?
CVE-2023-27582 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2023-27582?
A fix for CVE-2023-27582 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2023-27582 are linked in the Vendor Advisories panel on this page.

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