CVE-2010-3971

NONECVSS 0.09.0▲
EchelonGraph scoreLOW confidence

Score elevated to 9.0 because EPSS predicts 86% probability of exploitation within the next 30 days (top 0.6% of all CVEs). Confidence: see factors.

Triggered by: EPSS exploit prediction ≥85%
Sources: epss
Weaponized
0.0
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 82%
CISA-KEV: Not listedEPSS: 82%CVSS: —Exploit: 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 the CSharedStyleSheet::Notify function in the Cascading Style Sheets (CSS) parser in mshtml.dll, as used in Microsoft Internet Explorer 6 through 8 and other products, allows remote attackers to execute arbitrary code or cause a denial of service (application crash) via a self-referential @import rule in a stylesheet, aka "CSS Memory Corruption Vulnerability."

CVSS v3
—
EG Score
9.0(low)
EPSS
99.6%
KEV
Not listed

Published

December 22, 2010

Last Modified

April 29, 2026

References (32)

Data Freshness Timeline

(refreshed 4× in last 7d / 20× 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. 2026-07-06 02:19 UTCEPSS rescore
  2. 2026-07-06 02:19 UTCEPSS rescore
  3. 2026-07-02 14:01 UTCEPSS rescore
  4. 2026-07-01 15:02 UTCEPSS rescore
  5. 2026-06-28 04:52 UTCEPSS rescore
  6. 2026-06-28 04:52 UTCEPSS rescore
  7. 2026-06-27 03:05 UTCEPSS rescore
  8. 2026-06-25 13:46 UTCEPSS rescore
  9. 2026-06-23 21:30 UTCEPSS rescore
  10. 2026-06-23 21:29 UTCEPSS rescore
  11. 2026-06-21 01:56 UTCEPSS rescore
  12. 2026-06-21 01:56 UTCEPSS rescore
  13. 2026-06-17 17:49 UTCEPSS rescore
  14. 2026-06-17 17:49 UTCEPSS rescore
  15. 2026-06-16 17:49 UTCEPSS rescore
  16. 2026-06-15 17:44 UTCEPSS rescore
  17. 2026-06-12 23:08 UTCEPSS rescore
  18. 2026-06-12 23:08 UTCEPSS rescore
  19. 2026-06-10 22:14 UTCEPSS rescore
  20. 2026-06-10 13:17 UTCEPSS rescore
  21. 2026-06-05 22:44 UTCEPSS rescore
  22. 2026-06-05 22:44 UTCEPSS rescore
  23. 2026-06-04 13:09 UTCEPSS rescore
  24. 2026-06-04 13:09 UTCEPSS rescore
  25. 2026-06-02 20:10 UTCEPSS rescore
Show 20 more
  1. 2026-06-02 20:10 UTCEPSS rescore
  2. 2026-05-31 00:14 UTCEPSS rescore
  3. 2026-05-31 00:13 UTCEPSS rescore
  4. 2026-05-29 09:24 UTCEG score recompute
  5. 2026-05-29 09:24 UTCGHSA enrichment
  6. 2026-05-28 13:42 UTCEPSS rescore
  7. 2026-05-28 13:42 UTCEPSS rescore
  8. 2026-05-26 13:41 UTCEPSS rescore
  9. 2026-05-26 13:41 UTCEPSS rescore
  10. 2026-05-22 21:15 UTCEPSS rescore
  11. 2026-05-22 21:15 UTCEPSS rescore
  12. 2026-05-22 21:15 UTCEPSS rescore
  13. 2026-05-21 22:39 UTCEPSS rescore
  14. 2026-05-20 22:37 UTCEPSS rescore
  15. 2026-05-20 22:37 UTCEPSS rescore
  16. 2026-05-20 22:37 UTCEPSS rescore
  17. 2026-05-20 11:21 UTCEPSS rescore
  18. 2026-05-20 11:21 UTCEPSS rescore
  19. 2026-05-18 21:29 UTCEPSS rescore
  20. 2026-05-18 21:29 UTCEPSS rescore

Publicly available exploits

(5 references)

Working exploit code is in the public domain (1 Metasploit module) (1 GitHub PoC) (3 Exploit-DB entries). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCnektra/CVE-2010-3971-hotpatch
    First seen Aug 7, 2013

    Do you own security hotfix with Deviare hooking

    Open source ↗
  • Exploit-DBEDB-16533✓ verified
    First seen Feb 8, 2011

    Microsoft Internet Explorer - CSS Recursive Import Use-After-Free (MS11-003) (Metasploit)

    Open source ↗
  • Exploit-DBEDB-15746✓ verified
    First seen Dec 15, 2010

    Microsoft Internet Explorer 8 - CSS Parser

    Open source ↗
  • Exploit-DBEDB-15708✓ verified
    First seen Dec 8, 2010

    Microsoft Internet Explorer 8 - CSS Parser Denial of Service

    Open source ↗
  • Metasploitexploit/windows/browser/ms11_003_ie_css_import✓ verified
    First seen Nov 29, 2010

    MS11-003 Microsoft Internet Explorer CSS Recursive Import Use After Free

    Open source ↗

Frequently asked(4)

What is CVE-2010-3971?
CVE-2010-3971 is a none vulnerability published on December 22, 2010. Use-after-free vulnerability in the CSharedStyleSheet::Notify function in the Cascading Style Sheets (CSS) parser in mshtml.dll, as used in Microsoft Internet Explorer 6 through 8 and other products, allows remote attackers to execute arbitrary code or cause a denial of service (application crash)…
When was CVE-2010-3971 disclosed?
CVE-2010-3971 was first published in the National Vulnerability Database on December 22, 2010, 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-2010-3971 actively exploited?
CVE-2010-3971 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 99.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
How do I remediate CVE-2010-3971?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2010-3971, 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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