CVE-2012-4787

CRITICALNVD 9.09.0—
EchelonGraph scoreMEDIUM confidence

Score 9.0 from GitHub Security Advisory (severity: HIGH) published 2022-05-13. NVD baseline CVSS 9.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
9.0
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 18%CVSS: 9.0Exploit: NoneExposed: 0

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

Use-after-free vulnerability in Microsoft Internet Explorer 9 and 10 allows remote attackers to execute arbitrary code via a crafted web site that triggers access to an object that (1) was not properly initialized or (2) is deleted, aka "Improper Ref Counting Use After Free Vulnerability."

CVSS v3
9.0
EG Score
9.0(medium)
EG Risk
57(Track)
EG Risk 57/100SSVC: 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
Severity90% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
96.8%
KEV
Not listed

Published

December 12, 2012

Last Modified

April 29, 2026

Advisory Details (1)

Auto-updated Apr 29, 2026
No patch confirmed yet.
generic

Microsoft Security Bulletin MS12-077 - Critical | Microsoft Learn

https://docs.microsoft.com/en-us/security-updates/securitybulletins/2012/ms12-077

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 39× 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.

  1. 2026-07-23 01:08 UTCEG score recompute
  2. 2026-07-23 00:11 UTCEG score recompute
  3. 2026-07-22 21:50 UTCEG score recompute
  4. 2026-07-22 14:04 UTCEPSS rescore
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  1. 2026-07-01 15:02 UTCEPSS rescore
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  43. 2026-05-31 22:28 UTCEPSS rescore
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  45. 2026-05-31 00:14 UTCEPSS rescore
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  47. 2026-05-29 13:41 UTCEPSS rescore
  48. 2026-05-29 01:37 UTCEG score recompute
  49. 2026-05-29 01:36 UTCGHSA enrichment
  50. 2026-05-28 13:42 UTCEPSS rescore
  51. 2026-05-28 13:42 UTCEPSS rescore
  52. 2026-05-27 13:38 UTCEPSS rescore
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  65. 2026-05-18 21:29 UTCEPSS rescore
  66. 2026-05-18 21:29 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2012-4787?
CVE-2012-4787 is a critical vulnerability published on December 12, 2012. Use-after-free vulnerability in Microsoft Internet Explorer 9 and 10 allows remote attackers to execute arbitrary code via a crafted web site that triggers access to an object that (1) was not properly initialized or (2) is deleted, aka "Improper Ref Counting Use After Free Vulnerability."
When was CVE-2012-4787 disclosed?
CVE-2012-4787 was first published in the National Vulnerability Database on December 12, 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-2012-4787 actively exploited?
CVE-2012-4787 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 96.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2012-4787?
CVE-2012-4787 has a CVSS v3 base score of 9.0 (NVD).
How do I remediate CVE-2012-4787?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2012-4787, 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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