CVE-2022-22747

MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2022-12-22. NVD baseline CVSS 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 6.5Exploit: None knownExposed: 0

A fix is available — apply it.

After accepting an untrusted certificate, handling an empty pkcs7 sequence as part of the certificate data could have lead to a crash. This crash is believed to be unexploitable. This vulnerability affects Firefox ESR < 91.5, Firefox < 96, and Thunderbird < 91.5.

CVSS v3
6.5
EG Score
6.5(medium)
EG Risk
30(Track)
EG Risk 30/100SSVC: Track

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
Severity65% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
49%
KEV
Not listed

Published

December 22, 2022

Last Modified

April 16, 2025

References (8)

Vendor Advisories for CVE-2022-22747(2)

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

Patch Availability(15)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuthunderbird-locale-id (1:91.5.0+build1-0ubuntu0.20.04.1) @ focal2026-05-25ubuntu
ubuntulibnss3-tools (2:3.68.2-0ubuntu1.1) @ jammy2026-05-25ubuntu
ubuntufirefox-locale-ast (96.0+build2-0ubuntu0.21.10.1) @ impish2026-05-25ubuntu
ubuntuthunderbird-locale-id (1:91.5.0+build1-0ubuntu0.21.10.1) @ impish2026-05-25ubuntu
ubuntulibnss3-tools (2:3.28.4-0ubuntu0.16.04.14+esm3) @ xenial2026-05-25ubuntu
redhatfirefox-0:91.5.0-1.el8_42022-01-12redhat
redhatthunderbird-0:91.5.0-1.el8_42022-01-12redhat
redhatfirefox-0:91.5.0-1.el8_52022-01-12redhat
redhatfirefox-0:91.5.0-1.el8_12022-01-12redhat
redhatthunderbird-0:91.5.0-1.el8_12022-01-12redhat
redhatfirefox-0:91.5.0-1.el8_22022-01-12redhat
redhatfirefox-0:91.5.0-1.el7_92022-01-12redhat
redhatthunderbird-0:91.5.0-1.el7_92022-01-12redhat
redhatthunderbird-0:91.5.0-1.el8_52022-01-12redhat
redhatthunderbird-0:91.5.0-1.el8_22022-01-12redhat

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

(18 across 6 ecosystems)
Debian:10(3)
PackageVulnerable rangeFixed inDependents
firefox-esr60.7.2esr-1 ... 91.5.0esr-1~deb9u1 (125 versions)91.5.0esr-1~deb10u1—
nss2:3.42.1-1, 2:3.42.1-1+deb10u1, 2:3.42.1-1+deb10u2, 2:3.42.1-1+deb10u3, 2:3.42.1-1+deb10u42:3.42.1-1+deb10u5—
thunderbird1:60.7.2-1 ... 1:91.5.0-1~deb9u1 (157 versions)1:91.5.0-2~deb10u1—
Debian:11(3)
PackageVulnerable rangeFixed inDependents
firefox-esr78.12.0esr-1 ... 91.5.0esr-1~deb9u1 (23 versions)91.5.0esr-1~deb11u1—
nss2:3.61-1, 2:3.61-1+deb11u12:3.61-1+deb11u2—
thunderbird1:78.12.0-1 ... 1:91.5.0-2~deb10u1 (34 versions)1:91.5.0-2~deb11u1—
Debian:12(3)
PackageVulnerable rangeFixed inDependents
firefox-esr—91.5.0esr-1—
nss—2:3.73-1—
thunderbird—1:91.5.0-1—
Debian:13(3)
PackageVulnerable rangeFixed inDependents
firefox-esr—91.5.0esr-1—
nss—2:3.73-1—
thunderbird—1:91.5.0-1—
Debian:14(3)
PackageVulnerable rangeFixed inDependents
firefox-esr—91.5.0esr-1—
nss—2:3.73-1—
thunderbird—1:91.5.0-1—
Debian:9(3)
PackageVulnerable rangeFixed inDependents
firefox-esr45.9.0esr-1 ... 91.4.1esr-1~deb9u1 (232 versions)91.5.0esr-1~deb9u1—
nss2:3.26.2-1.1, 2:3.26.2-1.1+deb9u1, 2:3.26.2-1.1+deb9u2, 2:3.26.2-1.1+deb9u3, 2:3.26.2-1.1+deb9u42:3.26.2-1.1+deb9u5—
thunderbird1.5-4 ... 1:91.4.1-1~deb9u1 (237 versions)1:91.5.0-1~deb9u1—

Weakness Classification(1)

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

Additional Vendor Advisories

(13)

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 5× in last 7d / 26× 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 157 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2022-22747?
CVE-2022-22747 is a medium vulnerability published on December 22, 2022. After accepting an untrusted certificate, handling an empty pkcs7 sequence as part of the certificate data could have lead to a crash. This crash is believed to be unexploitable. This vulnerability affects Firefox ESR < 91.5, Firefox < 96, and Thunderbird < 91.5.
When was CVE-2022-22747 disclosed?
CVE-2022-22747 was first published in the National Vulnerability Database on December 22, 2022, with the most recent update on April 16, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2022-22747 actively exploited?
CVE-2022-22747 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 51.3% of all scored CVEs.
What is the CVSS score of CVE-2022-22747?
CVE-2022-22747 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2022-22747?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2022-22747, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2022-22747

Explore →

Is Your Infrastructure Affected by CVE-2022-22747?

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

Start Free Scan →Browse All CVEs