CVE-2015-5291

MEDIUMCVSS v2 · 6.86.8—
EchelonGraph scoreLOW confidence

This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 6.8 — 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:M/Au:N/C:P/I:P/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 3.7% 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
6.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 3.7%CVSS v2: 6.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Heap-based buffer overflow in PolarSSL 1.x before 1.2.17 and ARM mbed TLS (formerly PolarSSL) 1.3.x before 1.3.14 and 2.x before 2.1.2 allows remote SSL servers to cause a denial of service (client crash) and possibly execute arbitrary code via a long hostname to the server name indication (SNI) extension, which is not properly handled when creating a ClientHello message. NOTE: this identifier has been SPLIT per ADT3 due to different affected version ranges. See CVE-2015-8036 for the session ticket issue that was introduced in 1.3.0.

CVSS v2.0 (legacy)
6.8MEDIUMNVD never assigned a CVSS v3 rating to this CVE
EG Score
6.8MEDIUMlow confidence
EG Risk
37
EG Risk 37/100CISA 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
Severity68% × 45%
Exploitation4% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track or Track* or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
3.7%
EPSS %ILE
89th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track or Track* or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact unknown (not published for this CVE). 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

November 2, 2015

Last Modified

June 5, 2026

References (20)

Affected Packages

(3 across 3 ecosystems)
Debian:6.0(1)
PackageVulnerable rangeFix by version rangeDependents
polarssl0.12.1-1 ... 1.2.9-1~deb6u4 (26 versions)
  • every version up to 1.2.9-1~deb6u5: fixed in 1.2.9-1~deb6u5
—
Debian:7(1)
PackageVulnerable rangeFix by version rangeDependents
polarssl1.1.4-2 ... 1.2.9-1~deb7u5 (20 versions)
  • every version up to 1.2.9-1~deb7u6: fixed in 1.2.9-1~deb7u6
—
Debian:8(1)
PackageVulnerable rangeFix by version rangeDependents
polarssl1.3.9-2.1
  • every version up to 1.3.9-2.1+deb8u1: fixed in 1.3.9-2.1+deb8u1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 22× 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 151 total refreshes for this CVE.

  1. 2026-10-05 17:38 UTCEPSS rescore
  2. 2026-10-04 23:17 UTCEPSS rescore
  3. 2026-10-03 14:21 UTCEPSS rescore
  4. 2026-09-30 14:58 UTCEPSS rescore
  5. 2026-09-30 14:58 UTCEPSS rescore
  6. 2026-09-30 09:05 UTCEG score recompute
  7. 2026-09-28 13:45 UTCEPSS rescore
  8. 2026-09-27 13:40 UTCEPSS rescore
  9. 2026-09-26 15:53 UTCEPSS rescore
  10. 2026-09-26 15:53 UTCEPSS rescore
  11. 2026-09-23 13:41 UTCEPSS rescore
  12. 2026-09-20 20:09 UTCEPSS rescore
  13. 2026-09-19 15:35 UTCEPSS rescore
  14. 2026-09-18 19:22 UTCEPSS rescore
  15. 2026-09-17 19:21 UTCEPSS rescore
  16. 2026-09-15 03:05 UTCEPSS rescore
  17. 2026-09-13 16:41 UTCEPSS rescore
  18. 2026-09-12 14:55 UTCEPSS rescore
  19. 2026-09-11 09:31 UTCEPSS rescore
  20. 2026-09-10 09:26 UTCEPSS rescore
  21. 2026-09-07 15:56 UTCEPSS rescore
  22. 2026-09-06 13:42 UTCEPSS rescore
  23. 2026-09-04 13:55 UTCEPSS rescore
  24. 2026-09-02 14:07 UTCEPSS rescore
  25. 2026-09-01 13:48 UTCEPSS rescore
Show 75 more
  1. 2026-09-01 03:31 UTCEPSS rescore
  2. 2026-08-27 14:20 UTCEPSS rescore
  3. 2026-08-26 14:41 UTCEPSS rescore
  4. 2026-08-25 13:44 UTCEPSS rescore
  5. 2026-08-23 00:13 UTCEPSS rescore
  6. 2026-08-21 23:44 UTCEPSS rescore
  7. 2026-08-20 22:50 UTCEPSS rescore
  8. 2026-08-19 16:59 UTCEPSS rescore
  9. 2026-08-18 13:43 UTCEPSS rescore
  10. 2026-08-16 14:51 UTCEPSS rescore
  11. 2026-08-16 02:09 UTCEPSS rescore
  12. 2026-08-15 01:25 UTCEPSS rescore
  13. 2026-08-12 13:46 UTCEPSS rescore
  14. 2026-08-11 13:36 UTCEPSS rescore
  15. 2026-08-09 13:42 UTCEPSS rescore
  16. 2026-08-08 16:32 UTCEPSS rescore
  17. 2026-08-07 16:22 UTCEPSS rescore
  18. 2026-08-06 13:42 UTCEPSS rescore
  19. 2026-08-05 19:12 UTCEPSS rescore
  20. 2026-08-04 15:04 UTCEPSS rescore
  21. 2026-08-04 10:31 UTCEPSS rescore
  22. 2026-08-01 04:11 UTCEPSS rescore
  23. 2026-07-30 01:26 UTCEPSS rescore
  24. 2026-07-30 01:26 UTCEPSS rescore
  25. 2026-07-28 15:31 UTCEPSS rescore
  26. 2026-07-26 14:50 UTCEPSS rescore
  27. 2026-07-26 13:54 UTCEG score recompute▲ 6.80
  28. 2026-07-25 14:13 UTCEPSS rescore
  29. 2026-07-24 14:13 UTCEPSS rescore
  30. 2026-07-23 14:14 UTCEPSS rescore
  31. 2026-07-23 01:18 UTCEG score recompute
  32. 2026-07-23 00:20 UTCEG score recompute
  33. 2026-07-22 21:59 UTCEG score recompute
  34. 2026-07-22 14:04 UTCEPSS rescore
  35. 2026-07-21 15:21 UTCEPSS rescore
  36. 2026-07-21 15:21 UTCEPSS rescore
  37. 2026-07-20 17:03 UTCEPSS rescore
  38. 2026-07-19 14:27 UTCEPSS rescore
  39. 2026-07-19 14:27 UTCEPSS rescore
  40. 2026-07-19 02:26 UTCEPSS rescore
  41. 2026-07-19 02:26 UTCEPSS rescore
  42. 2026-07-18 10:00 UTCEPSS rescore
  43. 2026-07-16 16:59 UTCEPSS rescore
  44. 2026-07-15 16:54 UTCEPSS rescore
  45. 2026-07-15 16:54 UTCEPSS rescore
  46. 2026-07-15 01:56 UTCEPSS rescore
  47. 2026-07-13 22:26 UTCEPSS rescore
  48. 2026-07-13 22:26 UTCEPSS rescore
  49. 2026-07-12 05:42 UTCEPSS rescore
  50. 2026-07-11 08:23 UTCEPSS rescore
  51. 2026-07-09 19:05 UTCEPSS rescore
  52. 2026-07-09 19:05 UTCEPSS rescore
  53. 2026-07-08 15:10 UTCEPSS rescore
  54. 2026-07-07 13:42 UTCEPSS rescore
  55. 2026-07-07 13:42 UTCEPSS rescore
  56. 2026-07-06 16:24 UTCEPSS rescore
  57. 2026-07-06 02:20 UTCEPSS rescore
  58. 2026-07-05 02:26 UTCEPSS rescore
  59. 2026-07-04 06:28 UTCEPSS rescore
  60. 2026-07-01 15:02 UTCEPSS rescore
  61. 2026-06-30 23:19 UTCEPSS rescore
  62. 2026-06-30 23:19 UTCEPSS rescore
  63. 2026-06-29 14:03 UTCEPSS rescore
  64. 2026-06-29 14:03 UTCEPSS rescore
  65. 2026-06-28 14:04 UTCEPSS rescore
  66. 2026-06-28 04:53 UTCEPSS rescore
  67. 2026-06-27 03:05 UTCEPSS rescore
  68. 2026-06-25 13:47 UTCEPSS rescore
  69. 2026-06-25 13:47 UTCEPSS rescore
  70. 2026-06-24 14:02 UTCEPSS rescore
  71. 2026-06-24 14:02 UTCEPSS rescore
  72. 2026-06-23 21:30 UTCEPSS rescore
  73. 2026-06-22 14:23 UTCEPSS rescore
  74. 2026-06-22 14:23 UTCEPSS rescore
  75. 2026-06-21 01:57 UTCEPSS rescore

Related CVEs(same product + same CWE)

Frequently asked(4)

What is CVE-2015-5291?
CVE-2015-5291 is a medium vulnerability published on November 2, 2015. Heap-based buffer overflow in PolarSSL 1.x before 1.2.17 and ARM mbed TLS (formerly PolarSSL) 1.3.x before 1.3.14 and 2.x before 2.1.2 allows remote SSL servers to cause a denial of service (client crash) and possibly execute arbitrary code via a long hostname to the server name indication (SNI)…
When was CVE-2015-5291 disclosed?
CVE-2015-5291 was first published on November 2, 2015, with the most recent update on June 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2015-5291 actively exploited?
CVE-2015-5291 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3.7% probability of exploitation in the next 30 days (89th percentile of EPSS-scored CVEs).
How do I remediate CVE-2015-5291?
A fix for CVE-2015-5291 is available: update to the fixed version the vendor names in its advisory.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2015-5291

Explore →

Is Your Infrastructure Affected by CVE-2015-5291?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs