CVE-2013-3660

CRITICALNVD 7.89.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2022-03-28), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 7.8 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 3 sources updated this weekExploited in the wild
9.0EG
EchelonGraph verdictMitigate nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 39%CVSS: 7.8Exploit: cisa kev · ssvc active · Metasploit · Exploit-DB (verified) · epss top5pct · public exploitExposed services: Not assessed

A fix is referenced (a reference tagged "Patch", often a source commit), but no release containing it is confirmed — find the release that contains it; until it is applied, mitigate (WAF / firewall / segmentation).

The EPATHOBJ::pprFlattenRec function in win32k.sys in the kernel-mode drivers in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8, and Windows Server 2012 does not properly initialize a pointer for the next object in a certain list, which allows local users to obtain write access to the PATHRECORD chain, and consequently gain privileges, by triggering excessive consumption of paged memory and then making many FlattenPath function calls, aka "Win32k Read AV Vulnerability."

CVSS v3
7.8
EG Score
9.0CRITICALhigh confidence
EG Risk
81
EG Risk 81/100CISA 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
Severity90% × 45%
Exploitation100% × 40%
Automatability0% × 15%
CISA SSVC: Track at low, Attend at medium and Act at high mission impact.
Action: A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that within your standard update timelines at low, sooner than that at medium and as soon as possible at high mission impact; until then, restrict network exposure of the affected system or apply the vendor's mitigation.
EPSS PROB
39%
EPSS %ILE
98th
KEV
⚠ Exploited

CISA SSVCTrack at low, Attend at medium and Act at high mission impact.

A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that within your standard update timelines at low, sooner than that at medium and as soon as possible at high mission impact; until then, restrict network exposure of the affected system or apply the vendor's mitigation.

Exploitation active (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). 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

May 24, 2013

Last Modified

April 22, 2026

Advisory Details (2)

Auto-updated May 19, 2026
🔬 Proof of concept available. Fix referenced — no release confirmed yet.
generic🟡 PoC Available

Microsoft Windows - Win32k!EPATHOBJ::pprFlattenRec Uninitialized Next Pointer Testcase - Windows dos Exploit

http://www.exploit-db.com/exploits/25611/
generic

About Secunia Research | Flexera

http://secunia.com/advisories/53435

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 47× in last 7d / 220× 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 951 total refreshes for this CVE.

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

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.

  • Exploit-DBEDB-26554✓ verified
    First seen Jul 2, 2013

    Microsoft Windows - 'EPATHOBJ::pprFlattenRec' Local Privilege Escalation (Metasploit)

    Open source ↗
  • Exploit-DBEDB-25912✓ verified
    First seen Jun 3, 2013

    Microsoft Windows NT/2000/2003/2008/XP/Vista/7/8 - 'EPATHOBJ' Local Ring

    Open source ↗
  • Exploit-DBEDB-25611✓ verified
    First seen May 21, 2013

    Microsoft Windows - Win32k!EPATHOBJ::pprFlattenRec Uninitialized Next Pointer Testcase

    Open source ↗
  • Metasploitexploit/windows/local/ppr_flatten_rec✓ verified
    First seen May 15, 2013

    Windows EPATHOBJ::pprFlattenRec Local Privilege Escalation

    Open source ↗
  • GitHub PoCExploitCN/CVE-2013-3660-x64-WIN7
    First seen Jan 29, 2022

    CVE-2013-3660的x64 win7平台EXP源代码，成功率100%。

    Open source ↗

Related CVEs(same CWE)

Frequently asked(6)

What is CVE-2013-3660?
CVE-2013-3660 is a critical vulnerability published on May 24, 2013. The EPATHOBJ::pprFlattenRec function in win32k.sys in the kernel-mode drivers in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8, and Windows Server 2012 does not properly initialize a pointer for the next…
When was CVE-2013-3660 disclosed?
CVE-2013-3660 was first published on May 24, 2013, with the most recent update on April 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2013-3660 actively exploited?
Yes. CISA added CVE-2013-3660 to the Known Exploited Vulnerabilities catalog on March 28, 2022, affecting Microsoft Win32k. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate attention. A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that; until then, restrict network exposure of the affected system or apply the vendor's mitigation.
What is the CVSS score of CVE-2013-3660?
CVE-2013-3660 has a CVSS v3 base score of 7.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0 (CRITICAL).
Which products are affected by CVE-2013-3660?
CVE-2013-3660 affects Microsoft Win32k.
How do I remediate CVE-2013-3660?
A fix for CVE-2013-3660 is referenced (a reference tagged "Patch", often a source commit), but EchelonGraph has no release containing it on record. Check that reference and the vendor's advisory for a release that contains the fix and update to it; until then, restrict network exposure of the affected system or apply the vendor's mitigation.

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