CVE-2015-2311

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-17. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 3%CVSS: 9.8Exploit: NoneExposed: 0

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

Integer underflow in Sandstorm Cap'n Proto before 0.4.1.1 and 0.5.x before 0.5.1.1 might allow remote peers to cause a denial of service or possibly obtain sensitive information from memory or execute arbitrary code via a crafted message.

CVSS v3
9.8
EG Score
9.8(medium)
EPSS
83.1%
KEV
Not listed

Published

August 9, 2017

Last Modified

May 13, 2026

Advisory Details (4)

Auto-updated Jun 21, 2026
Patch available. Sources: github_commit.
github_commit

commit 26bcceda7237 (capnproto/capnproto)

Fix landed in capnproto/capnproto commit 26bcceda7237 — awaiting tagged release

https://github.com/capnproto/capnproto/commit/26bcceda72372211063d62aab7e45665faa83633
generic

capnproto/security-advisories/2015-03-02-1-c++-integer-underflow.md at master · capnproto/capnproto · GitHub

https://github.com/capnproto/capnproto/blob/master/security-advisories/2015-03-02-1-c%2B%2B-integer-underflow.md
generic Patch Available

#780566 - capnproto: CVE-2015-2311: Integer underflow in pointer validation - Debian Bug report logs

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=780566
generic

oss-security - Re: CVE Request: Cap'n Proto: Several issues

http://www.openwall.com/lists/oss-security/2015/03/17/3

Data Freshness Timeline

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

Frequently asked(5)

What is CVE-2015-2311?
CVE-2015-2311 is a critical vulnerability published on August 9, 2017. Integer underflow in Sandstorm Cap'n Proto before 0.4.1.1 and 0.5.x before 0.5.1.1 might allow remote peers to cause a denial of service or possibly obtain sensitive information from memory or execute arbitrary code via a crafted message.
When was CVE-2015-2311 disclosed?
CVE-2015-2311 was first published in the National Vulnerability Database on August 9, 2017, with the most recent update on May 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2015-2311 actively exploited?
CVE-2015-2311 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 83.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2015-2311?
CVE-2015-2311 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2015-2311?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2015-2311, 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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