CVE-2012-4922

MEDIUMCVSS v2 · 5.05.0—
EchelonGraph scoreLOW confidence

This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 5.0 — v2 rates that MEDIUM (v2 bands: LOW 0.0–3.9 / MEDIUM 4.0–6.9 / HIGH 7.0–10.0; v2 has no CRITICAL band). Vector AV:N/AC:L/Au:N/C:N/I:N/A:P. CVSS v2 is an older, coarser metric than v3.1/v4.0 (no Scope, no User Interaction, no Attack Requirements), so it is not directly comparable to a v3 or v4 score. NVD has never re-scored this record under v3. EPSS predicts 2.2% exploitation probability in the next 30 days, which is reflected in EG Risk but does not lift the v2 base. Confidence: LOW.

Sources: epss, nvd_v2
5.0EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 2%CVSS v2: 5.0Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

The tor_timegm function in common/util.c in Tor before 0.2.2.39, and 0.2.3.x before 0.2.3.22-rc, does not properly validate time values, which allows remote attackers to cause a denial of service (assertion failure and daemon exit) via a malformed directory object, a different vulnerability than CVE-2012-4419.

CVSS v2.0 (legacy)
5.0MEDIUMNVD never assigned a CVSS v3 rating to this CVE
EG Score
5.0(low)
EG Risk
28(Track)
EG Risk 28/100SSVC: 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
Severity50% × 45%
Exploitation2% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
2%
EPSS %ILE
81%
KEV
Not listed

Published

September 14, 2012

Last Modified

April 29, 2026

References (16)

Affected Packages

(5 across 5 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
tor—0.2.3.22-rc-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
tor—0.2.3.22-rc-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
tor—0.2.3.22-rc-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
tor—0.2.3.22-rc-1—
Debian:6.0(1)
PackageVulnerable rangeFixed inDependents
tor0.2.1.29-1 ... 0.2.2.9-alpha-1 (49 versions)0.2.2.39-1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 5× in last 7d / 17× 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 127 total refreshes for this CVE.

  1. 2026-08-27 14:20 UTCEPSS rescore
  2. 2026-08-26 14:40 UTCEPSS rescore
  3. 2026-08-24 02:52 UTCOSV refresh
  4. 2026-08-23 00:12 UTCEPSS rescore
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  12. 2026-08-08 00:19 UTCOSV refresh
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  19. 2026-07-26 13:46 UTCEG score recompute▲ 5.00
  20. 2026-07-25 14:12 UTCEPSS rescore
  21. 2026-07-23 14:14 UTCEPSS rescore
  22. 2026-07-23 01:08 UTCEG score recompute
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  24. 2026-07-22 21:50 UTCEG score recompute
  25. 2026-07-22 17:20 UTCOSV refresh
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  1. 2026-07-22 14:04 UTCEPSS rescore
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  22. 2026-07-05 12:29 UTCOSV refresh
  23. 2026-07-05 02:26 UTCEPSS rescore
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  25. 2026-07-02 14:01 UTCEPSS rescore
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  27. 2026-06-30 23:19 UTCEPSS rescore
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  49. 2026-06-17 17:49 UTCEPSS rescore
  50. 2026-06-16 23:43 UTCOSV refresh
  51. 2026-06-16 17:49 UTCEPSS rescore
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  72. 2026-06-01 13:49 UTCEPSS rescore
  73. 2026-05-31 22:28 UTCEPSS rescore
  74. 2026-05-31 22:28 UTCEPSS rescore
  75. 2026-05-31 00:14 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(4)

What is CVE-2012-4922?
CVE-2012-4922 is a medium vulnerability published on September 14, 2012. The tor_timegm function in common/util.c in Tor before 0.2.2.39, and 0.2.3.x before 0.2.3.22-rc, does not properly validate time values, which allows remote attackers to cause a denial of service (assertion failure and daemon exit) via a malformed directory object, a different vulnerability than…
When was CVE-2012-4922 disclosed?
CVE-2012-4922 was first published in the National Vulnerability Database on September 14, 2012, with the most recent update on April 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2012-4922 actively exploited?
CVE-2012-4922 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2% probability of exploitation in the next 30 days, which ranks it in the top 18.5% of all scored CVEs.
How do I remediate CVE-2012-4922?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2012-4922, 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.

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