CVE-2015-5334

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 3.5%, top 12% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, 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.

Off-by-one error in the OBJ_obj2txt function in LibreSSL before 2.3.1 allows remote attackers to cause a denial of service (program crash) or possible execute arbitrary code via a crafted X.509 certificate, which triggers a stack-based buffer overflow. Note: this vulnerability exists because of an incorrect fix for CVE-2014-3508.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
50(Track)
EG Risk 50/100SSVC: 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%
Exploitation3% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
87.9%
KEV
Not listed

Published

January 23, 2020

Last Modified

November 21, 2024

Advisory Details (4)

Auto-updated Jun 6, 2026
No patch confirmed yet.
generic
http://www.securityfocus.com/archive/1/archive/1/536692/100/0/threaded
generic

Full Disclosure: Qualys Security Advisory - LibreSSL (CVE-2015-5333 and CVE-2015-5334)

http://seclists.org/fulldisclosure/2015/Oct/75
generic

Packet Storm

http://packetstormsecurity.com/files/133998/Qualys-Security-Advisory-LibreSSL-Leak-Overflow.html
generic
http://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-2.3.1-relnotes.txt

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 14× in last 7d / 41× 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. 2026-07-23 14:14 UTCEPSS rescore
  2. 2026-07-23 01:18 UTCEG score recompute
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  58. 2026-05-27 08:45 UTCGHSA enrichment
  59. 2026-05-26 13:41 UTCEPSS rescore
  60. 2026-05-24 16:43 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2015-5334?
CVE-2015-5334 is a critical vulnerability published on January 23, 2020. Off-by-one error in the OBJ_obj2txt function in LibreSSL before 2.3.1 allows remote attackers to cause a denial of service (program crash) or possible execute arbitrary code via a crafted X.509 certificate, which triggers a stack-based buffer overflow. Note: this vulnerability exists because of an…
When was CVE-2015-5334 disclosed?
CVE-2015-5334 was first published in the National Vulnerability Database on January 23, 2020, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2015-5334 actively exploited?
CVE-2015-5334 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 87.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2015-5334?
CVE-2015-5334 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2015-5334?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2015-5334, 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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