CVE-2013-1331

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 2022-06-08), 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 — 4 sources updated this weekExploited in the wild
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 82%CVSS: 7.8Exploit: cisa kev · ssvc active · epss top5pct · epss highExposed: 0

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

Buffer overflow in Microsoft Office 2003 SP3 and Office 2011 for Mac allows remote attackers to execute arbitrary code via crafted PNG data in an Office document, leading to improper memory allocation, aka "Office Buffer Overflow Vulnerability."

CVSS v3
7.8
EG Score
9.0(high)
EG Risk
81(Attend)
EG Risk 81/100SSVC: Attend

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%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
82%
EPSS %ILE
100%
KEV
⚠ Exploited

Published

June 12, 2013

Last Modified

April 22, 2026

Advisory Details (2)

Auto-updated May 19, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa.
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2013-1331
generic

Microsoft Security Bulletin MS13-051 - Important | Microsoft Learn

https://docs.microsoft.com/en-us/security-updates/securitybulletins/2013/ms13-051

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 41× in last 7d / 203× 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 440 total refreshes for this CVE.

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

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Frequently asked(6)

What is CVE-2013-1331?
CVE-2013-1331 is a critical vulnerability published on June 12, 2013. Buffer overflow in Microsoft Office 2003 SP3 and Office 2011 for Mac allows remote attackers to execute arbitrary code via crafted PNG data in an Office document, leading to improper memory allocation, aka "Office Buffer Overflow Vulnerability."
When was CVE-2013-1331 disclosed?
CVE-2013-1331 was first published in the National Vulnerability Database on June 12, 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-2013-1331 actively exploited?
Yes. CISA added CVE-2013-1331 to the Known Exploited Vulnerabilities catalog on June 8, 2022, affecting Microsoft Office. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2013-1331?
CVE-2013-1331 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.
Which products are affected by CVE-2013-1331?
CVE-2013-1331 affects Microsoft Office. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2013-1331?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2013-1331, 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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