CVE-2011-1473

MEDIUMCVSS v2 · 5.05.0—
EchelonGraph scoreLOW confidence

This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 5.0 — v2 rates that MEDIUM (v2 bands: LOW 0.0–3.9 / MEDIUM 4.0–6.9 / HIGH 7.0–10.0; v2 has no CRITICAL band). Vector AV:N/AC:L/Au:N/C:N/I:N/A:P. CVSS v2 is an older, coarser metric than v3.1/v4.0 (no Scope, no User Interaction, no Attack Requirements), so it is not directly comparable to a v3 or v4 score. NVD has never re-scored this record under v3. EPSS predicts 66.4% exploitation probability in the next 30 days, which is reflected in EG Risk but does not lift the v2 base. Confidence: LOW.

Sources: epss, nvd_v2
Elevated
5.0EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 67%
CISA-KEV: Not listedEPSS PROB: 67%CVSS v2: 5.0Exploit: Elevated riskExposed: 0

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

OpenSSL before 0.9.8l, and 0.9.8m through 1.x, does not properly restrict client-initiated renegotiation within the SSL and TLS protocols, which might make it easier for remote attackers to cause a denial of service (CPU consumption) by performing many renegotiations within a single connection, a different vulnerability than CVE-2011-5094. NOTE: it can also be argued that it is the responsibility of server deployments, not a security library, to prevent or limit renegotiation when it is inappropriate within a specific environment

CVSS v2.0 (legacy)
5.0MEDIUMNVD never assigned a CVSS v3 rating to this CVE
EG Score
5.0(low)
EG Risk
54(Track)
EG Risk 54/100SSVC: 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
Severity50% × 45%
Exploitation66% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
67%
EPSS %ILE
99%
KEV
Not listed

Published

June 16, 2012

Last Modified

April 29, 2026

References (50)

Data Freshness Timeline

(refreshed 0× 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. 2026-08-19 16:58 UTCEPSS rescore
  2. 2026-08-15 01:25 UTCEPSS rescore
  3. 2026-08-08 16:31 UTCEPSS rescore
  4. 2026-08-06 13:41 UTCEPSS rescore
  5. 2026-08-05 19:12 UTCEPSS rescore
  6. 2026-07-30 01:26 UTCEPSS rescore
  7. 2026-07-26 13:43 UTCEG score recompute▲ 5.00
  8. 2026-07-23 14:14 UTCEPSS rescore
  9. 2026-07-23 01:04 UTCEG score recompute
  10. 2026-07-23 00:40 UTCEG score recompute▼ 6.00
  11. 2026-07-23 00:08 UTCEG score recompute▲ 6.00
  12. 2026-07-22 21:47 UTCEG score recompute
  13. 2026-07-22 14:03 UTCEPSS rescore
  14. 2026-07-21 15:21 UTCEPSS rescore
  15. 2026-07-20 17:03 UTCEPSS rescore
  16. 2026-07-20 17:03 UTCEPSS rescore
  17. 2026-07-19 02:25 UTCEPSS rescore
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  19. 2026-07-16 16:58 UTCEPSS rescore
  20. 2026-07-15 16:54 UTCEPSS rescore
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  22. 2026-07-13 22:25 UTCEPSS rescore
  23. 2026-07-13 06:08 UTCEPSS rescore
  24. 2026-07-11 08:22 UTCEPSS rescore
  25. 2026-07-11 08:22 UTCEPSS rescore
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  1. 2026-07-05 02:26 UTCEPSS rescore
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  5. 2026-06-30 23:19 UTCEPSS rescore
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  7. 2026-06-27 03:05 UTCEPSS rescore
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  9. 2026-06-25 13:46 UTCEPSS rescore
  10. 2026-06-24 14:02 UTCEPSS rescore
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  12. 2026-06-23 21:30 UTCEPSS rescore
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  14. 2026-06-18 17:49 UTCEPSS rescore
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  16. 2026-06-17 17:49 UTCEPSS rescore
  17. 2026-06-17 17:49 UTCEPSS rescore
  18. 2026-06-17 17:49 UTCEPSS rescore
  19. 2026-06-16 17:49 UTCEPSS rescore
  20. 2026-06-15 17:44 UTCEPSS rescore
  21. 2026-06-14 23:14 UTCEPSS rescore
  22. 2026-06-14 23:14 UTCEPSS rescore
  23. 2026-06-13 22:57 UTCEPSS rescore
  24. 2026-06-13 22:57 UTCEPSS rescore
  25. 2026-06-12 23:08 UTCEPSS rescore
  26. 2026-06-11 13:56 UTCEPSS rescore
  27. 2026-06-10 22:14 UTCEPSS rescore
  28. 2026-06-08 14:14 UTCEPSS rescore
  29. 2026-06-08 14:14 UTCEPSS rescore
  30. 2026-06-06 13:45 UTCEPSS rescore
  31. 2026-06-06 13:44 UTCEPSS rescore
  32. 2026-06-05 22:44 UTCEPSS rescore
  33. 2026-06-05 06:08 UTCEPSS rescore
  34. 2026-06-05 06:07 UTCEPSS rescore
  35. 2026-06-04 13:09 UTCEPSS rescore
  36. 2026-06-04 13:09 UTCEPSS rescore
  37. 2026-06-02 20:10 UTCEPSS rescore
  38. 2026-06-02 20:10 UTCEPSS rescore
  39. 2026-06-01 13:49 UTCEPSS rescore
  40. 2026-06-01 13:49 UTCEPSS rescore
  41. 2026-05-31 22:28 UTCEPSS rescore
  42. 2026-05-31 22:28 UTCEPSS rescore
  43. 2026-05-31 00:14 UTCEPSS rescore
  44. 2026-05-31 00:14 UTCEPSS rescore
  45. 2026-05-29 13:41 UTCEPSS rescore
  46. 2026-05-29 13:40 UTCEPSS rescore
  47. 2026-05-29 04:17 UTCEG score recompute
  48. 2026-05-29 04:17 UTCGHSA enrichment
  49. 2026-05-28 13:42 UTCEPSS rescore
  50. 2026-05-28 13:42 UTCEPSS rescore
  51. 2026-05-28 13:42 UTCEPSS rescore
  52. 2026-05-27 13:38 UTCEPSS rescore
  53. 2026-05-27 13:38 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
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  59. 2026-05-20 11:21 UTCEPSS rescore
  60. 2026-05-18 21:29 UTCEPSS rescore
  61. 2026-05-18 21:29 UTCEPSS rescore

Publicly available exploits

(1 reference)

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

  • GitHub PoCXDLDCG/bash-tls-reneg-attack
    First seen Aug 28, 2019

    A bash script that attempts to flood a server with TLS renegotiations by using the openssl client. See CVE-2011-1473 and CVE-2011-1473 for details.

    Open source ↗

Frequently asked(4)

What is CVE-2011-1473?
CVE-2011-1473 is a medium vulnerability published on June 16, 2012. OpenSSL before 0.9.8l, and 0.9.8m through 1.x, does not properly restrict client-initiated renegotiation within the SSL and TLS protocols, which might make it easier for remote attackers to cause a denial of service (CPU consumption) by performing many renegotiations within a single connection, a…
When was CVE-2011-1473 disclosed?
CVE-2011-1473 was first published in the National Vulnerability Database on June 16, 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-2011-1473 actively exploited?
CVE-2011-1473 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 67% probability of exploitation in the next 30 days, which ranks it in the top 0.8% of all scored CVEs.
How do I remediate CVE-2011-1473?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2011-1473, 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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