CVE-2011-0657

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: HIGH) published 2022-05-13. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Weaponized
9.8EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 62%
  • Public exploit code is available (Metasploit, epss top5pct, epss high, public exploit)
CISA-KEV: Not listedEPSS PROB: 62%CVSS: 9.8Exploit: Metasploit · epss top5pct · epss high · public exploitExposed: 0

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

DNSAPI.dll in the DNS client in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP1 and SP2, Windows Server 2008 Gold, SP2, R2, and R2 SP1, and Windows 7 Gold and SP1 does not properly process DNS queries, which allows remote attackers to execute arbitrary code via (1) a crafted LLMNR broadcast query or (2) a crafted application, aka "DNS Query Vulnerability."

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
85(Track)
EG Risk 85/100SSVC: 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
Severity98% × 45%
Exploitation65% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
62%
EPSS %ILE
99%
KEV
Not listed

Published

April 13, 2011

Last Modified

April 29, 2026

Advisory Details (5)

Auto-updated Aug 26, 2026
No patch confirmed yet.
generic

Microsoft Security Bulletin MS11-030 - Critical | Microsoft Learn

https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-030
generic

VUPEN Security - Vulnerability Research and Intelligence

http://www.vupen.com/english/advisories/2011/0948
generic
http://www.securitytracker.com/id?1025332
generic

CVE-2011-0657 - PSIRT.COM

http://www.securityfocus.com/bid/47242
generic

About Secunia Research | Flexera

http://secunia.com/advisories/44161

Data Freshness Timeline

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

Publicly available exploits

(1 reference)

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

  • Metasploitauxiliary/dos/windows/llmnr/ms11_030_dnsapi✓ verified
    First seen Apr 12, 2011

    Microsoft Windows DNSAPI.dll LLMNR Buffer Underrun DoS

    Open source ↗

Frequently asked(5)

What is CVE-2011-0657?
CVE-2011-0657 is a critical vulnerability published on April 13, 2011. DNSAPI.dll in the DNS client in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP1 and SP2, Windows Server 2008 Gold, SP2, R2, and R2 SP1, and Windows 7 Gold and SP1 does not properly process DNS queries, which allows remote attackers to execute arbitrary code via (1) a…
When was CVE-2011-0657 disclosed?
CVE-2011-0657 was first published in the National Vulnerability Database on April 13, 2011, 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-2011-0657 actively exploited?
CVE-2011-0657 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 62% probability of exploitation in the next 30 days, which ranks it in the top 0.9% of all scored CVEs.
What is the CVSS score of CVE-2011-0657?
CVE-2011-0657 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2011-0657?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2011-0657, 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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