CVE-2009-2408

MEDIUMNVD 5.95.9—
EchelonGraph scoreMEDIUM confidence

Score 5.9 from GitHub Security Advisory published 2022-05-02. NVD baseline CVSS 5.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 5.0%CVSS: 5.9Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Mozilla Network Security Services (NSS) before 3.12.3, Firefox before 3.0.13, Thunderbird before 2.0.0.23, and SeaMonkey before 1.1.18 do not properly handle a '\0' character in a domain name in the subject's Common Name (CN) field of an X.509 certificate, which allows man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority. NOTE: this was originally reported for Firefox before 3.5.

CVSS v3
5.9
EG Score
5.9MEDIUMmedium confidence
EG Risk
33
EG Risk 33/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity59% × 45%
Exploitation5% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).
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
5.0%
EPSS %ILE
91st
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track or 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 (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

July 30, 2009

Last Modified

April 23, 2026

Advisory Details (6)

Auto-updated Sep 11, 2026
Patch available.
generic

Secunia Research & Vulnerability Insights | Flexera

http://secunia.com/advisories/36669
generic

Secunia Research & Vulnerability Insights | Flexera

http://secunia.com/advisories/36434
generic

Secunia Research & Vulnerability Insights | Flexera

http://secunia.com/advisories/36157
generic

Secunia Research & Vulnerability Insights | Flexera

http://secunia.com/advisories/36139
generic

'[oss-security] More CVE-2009-2408 like issues' - MARC

http://marc.info/?l=oss-security&m=125198917018936&w=2
generic

SANS.edu Internet Storm Center - SANS Internet Storm Center

http://isc.sans.org/diary.html?storyid=7003

Patch Availability(6)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulibnss3-1d (3.12.3.1-0ubuntu0.8.04.1) @ hardy2026-05-30ubuntu
redhatseamonkey-0:1.0.9-0.45.el32009-09-09redhat
redhatnss-0:3.12.3.99.3-1.el5_22009-08-12redhat
redhatnss-0:3.12.3.99.3-1.el4_7.62009-07-31redhat
redhatnss-0:3.12.3.99.3-1.el5_3.22009-07-30redhat
redhatnss-0:3.12.3.99.3-1.el4_8.22009-07-30redhat

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

(6 across 5 ecosystems)
Debian:5.0(2)
PackageVulnerable rangeFix by version rangeDependents
icedove2.0.0.19-1, 2.0.0.19-1+kbsd, 2.0.0.22-0lenny1, 2.0.0.22-1, 2.0.0.22-1.1
  • every version up to 2.0.0.24-0lenny1: fixed in 2.0.0.24-0lenny1
—
nss3.12.0-5 ... 3.12.3-1 (6 versions)
  • every version up to 3.12.3.1-0lenny1: fixed in 3.12.3.1-0lenny1
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
nss—
  • every version up to 3.12.3-1: fixed in 3.12.3-1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
nss—
  • every version up to 3.12.3-1: fixed in 3.12.3-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
nss—
  • every version up to 3.12.3-1: fixed in 3.12.3-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
nss—
  • every version up to 3.12.3-1: fixed in 3.12.3-1
—

Weakness Classification(2)

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

All Vendor Advisories

(6)

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 / 18× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 138 total refreshes for this CVE.

  1. 2026-10-09 20:00 UTCEPSS rescore
  2. 2026-10-08 16:33 UTCEPSS rescore
  3. 2026-10-07 23:37 UTCEPSS rescore
  4. 2026-10-06 15:09 UTCEPSS rescore
  5. 2026-10-05 17:37 UTCEPSS rescore
  6. 2026-10-04 23:15 UTCEPSS rescore
  7. 2026-10-03 06:39 UTCOSV refresh
  8. 2026-09-30 14:58 UTCEPSS rescore
  9. 2026-09-29 07:59 UTCEG score recompute
  10. 2026-09-27 13:39 UTCEPSS rescore
  11. 2026-09-26 15:52 UTCEPSS rescore
  12. 2026-09-24 13:57 UTCEPSS rescore
  13. 2026-09-17 19:20 UTCEPSS rescore
  14. 2026-09-15 03:04 UTCEPSS rescore
  15. 2026-09-14 03:19 UTCOSV refresh
  16. 2026-09-13 16:40 UTCEPSS rescore
  17. 2026-09-12 14:54 UTCEPSS rescore
  18. 2026-09-10 09:24 UTCEPSS rescore
  19. 2026-09-06 13:41 UTCEPSS rescore
  20. 2026-09-05 15:22 UTCEPSS rescore
  21. 2026-09-04 13:55 UTCEPSS rescore
  22. 2026-08-28 21:34 UTCEPSS rescore
  23. 2026-08-27 14:19 UTCEPSS rescore
  24. 2026-08-26 04:39 UTCOSV refresh
  25. 2026-08-25 13:43 UTCEPSS rescore
Show 75 more
  1. 2026-08-19 16:58 UTCEPSS rescore
  2. 2026-08-15 01:24 UTCEPSS rescore
  3. 2026-08-09 21:10 UTCOSV refresh
  4. 2026-08-09 13:41 UTCEPSS rescore
  5. 2026-08-08 16:31 UTCEPSS rescore
  6. 2026-08-06 13:41 UTCEPSS rescore
  7. 2026-08-03 10:28 UTCEPSS rescore
  8. 2026-07-30 16:22 UTCEPSS rescore
  9. 2026-07-30 01:26 UTCEPSS rescore
  10. 2026-07-25 14:12 UTCEPSS rescore
  11. 2026-07-24 22:11 UTCOSV refresh
  12. 2026-07-24 14:12 UTCEPSS rescore
  13. 2026-07-23 14:14 UTCEPSS rescore
  14. 2026-07-23 00:59 UTCEG score recompute
  15. 2026-07-23 00:37 UTCEG score recompute
  16. 2026-07-23 00:04 UTCEG score recompute
  17. 2026-07-22 21:43 UTCEG score recompute
  18. 2026-07-22 14:03 UTCEPSS rescore
  19. 2026-07-21 15:20 UTCEPSS rescore
  20. 2026-07-20 17:03 UTCEPSS rescore
  21. 2026-07-20 17:03 UTCEPSS rescore
  22. 2026-07-18 09:59 UTCEPSS rescore
  23. 2026-07-16 16:58 UTCEPSS rescore
  24. 2026-07-15 16:54 UTCEPSS rescore
  25. 2026-07-15 16:54 UTCEPSS rescore
  26. 2026-07-15 01:55 UTCEPSS rescore
  27. 2026-07-13 22:25 UTCEPSS rescore
  28. 2026-07-13 06:07 UTCEPSS rescore
  29. 2026-07-11 08:22 UTCEPSS rescore
  30. 2026-07-11 08:22 UTCEPSS rescore
  31. 2026-07-09 19:04 UTCEPSS rescore
  32. 2026-07-08 15:10 UTCEPSS rescore
  33. 2026-07-07 17:11 UTCOSV refresh
  34. 2026-07-06 16:23 UTCEPSS rescore
  35. 2026-07-06 02:19 UTCEPSS rescore
  36. 2026-07-06 02:19 UTCEPSS rescore
  37. 2026-07-05 02:26 UTCEPSS rescore
  38. 2026-07-05 02:26 UTCEPSS rescore
  39. 2026-07-04 06:27 UTCEPSS rescore
  40. 2026-07-01 15:02 UTCEPSS rescore
  41. 2026-06-30 23:19 UTCEPSS rescore
  42. 2026-06-28 04:52 UTCEPSS rescore
  43. 2026-06-28 04:52 UTCEPSS rescore
  44. 2026-06-27 03:05 UTCEPSS rescore
  45. 2026-06-25 13:46 UTCEPSS rescore
  46. 2026-06-25 13:46 UTCEPSS rescore
  47. 2026-06-24 14:02 UTCEPSS rescore
  48. 2026-06-24 14:02 UTCEPSS rescore
  49. 2026-06-23 21:29 UTCEPSS rescore
  50. 2026-06-23 21:29 UTCEPSS rescore
  51. 2026-06-22 14:22 UTCEPSS rescore
  52. 2026-06-22 14:22 UTCEPSS rescore
  53. 2026-06-21 14:53 UTCEPSS rescore
  54. 2026-06-21 01:56 UTCEPSS rescore
  55. 2026-06-21 01:56 UTCEPSS rescore
  56. 2026-06-19 19:22 UTCEPSS rescore
  57. 2026-06-19 19:22 UTCEPSS rescore
  58. 2026-06-19 04:35 UTCOSV refresh
  59. 2026-06-18 17:49 UTCEPSS rescore
  60. 2026-06-18 17:49 UTCEPSS rescore
  61. 2026-06-17 17:49 UTCEPSS rescore
  62. 2026-06-17 17:49 UTCEPSS rescore
  63. 2026-06-16 17:49 UTCEPSS rescore
  64. 2026-06-16 17:49 UTCEPSS rescore
  65. 2026-06-15 17:44 UTCEPSS rescore
  66. 2026-06-14 23:14 UTCEPSS rescore
  67. 2026-06-14 23:14 UTCEPSS rescore
  68. 2026-06-13 22:57 UTCEPSS rescore
  69. 2026-06-12 23:08 UTCEPSS rescore
  70. 2026-06-12 23:08 UTCEPSS rescore
  71. 2026-06-10 22:14 UTCEPSS rescore
  72. 2026-06-10 13:17 UTCEPSS rescore
  73. 2026-06-08 14:13 UTCEPSS rescore
  74. 2026-06-07 15:22 UTCEPSS rescore
  75. 2026-06-07 15:22 UTCEPSS rescore

Related CVEs(same product + same vendor + same CWE)

Frequently asked(5)

What is CVE-2009-2408?
CVE-2009-2408 is a medium vulnerability published on July 30, 2009. Mozilla Network Security Services (NSS) before 3.12.3, Firefox before 3.0.13, Thunderbird before 2.0.0.23, and SeaMonkey before 1.1.18 do not properly handle a '\0' character in a domain name in the subject's Common Name (CN) field of an X.509 certificate, which allows man-in-the-middle attackers…
When was CVE-2009-2408 disclosed?
CVE-2009-2408 was first published on July 30, 2009, with the most recent update on April 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2009-2408 actively exploited?
CVE-2009-2408 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 5.0% probability of exploitation in the next 30 days (91st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2009-2408?
CVE-2009-2408 has a CVSS v3 base score of 5.9 (NVD).
How do I remediate CVE-2009-2408?
A fix for CVE-2009-2408 is available: update to the fixed version the vendor names in its advisory.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2009-2408

Explore →

Is Your Infrastructure Affected by CVE-2009-2408?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs