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Full vulnerability report · 2020
CVE-2015-5334High confidence

LibreSSL — Out-of-bounds Write

LibreSSL · LibreSSL

9.8CriticalCVSS 3.1
Recommended action
Within 72 hours

Critical technical impact with a remotely reachable, unauthenticated path and a public exploit reference; no CISA KEV confirmation is currently recorded.

Fix not verified
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityCriticalOperational priority:Critical, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • A structured source references public exploit or proof-of-concept material.
  • The selected CVSS metric records a network-reachable, unauthenticated path with no user interaction.
  • EPSS is 3.49% for the current model date.

Compensating controls

  • Restrict the affected network interface to trusted sources where business-safe.
  • Increase monitoring for the attack path and post-exploitation behaviour described in the report.

Verification

  1. Confirm that the asset runs LibreSSL LibreSSL and falls inside the recorded affected range.
  2. Recheck the vendor advisory before scheduling a change because no verified fixed version is currently retained.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: Within 3 daysRemediation target: Within 90 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2015-5304

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
Not supplied in the stored EUVD record
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 72 hours

Critical technical impact with a remotely reachable, unauthenticated path and a public exploit reference; no CISA KEV confirmation is currently recorded.

Fix not verified
01

What, why and how

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.

What

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.

Why

A bounds error lets data be written beyond the intended memory region, potentially corrupting control data.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may execute code or commands in the affected security context.

What

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.

Why

A bounds error lets data be written beyond the intended memory region, potentially corrupting control data.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may execute code or commands in the affected security context.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
Reference recorded

A structured CVE source labels at least one public reference as exploit material. BlackTree has not independently validated that it is safe, reliable or weaponised.

Likely attack path
a network path → Out-of-bounds Write → execute code or commands in the affected security context
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-787 ↗

CWE-787: Out-of-bounds Write. The product writes data past the end, or before the beginning, of the intended buffer.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
After compromise, an attacker may use built-in shells, scripting engines, scheduled tasks and native network utilities for discovery, persistence or movement. This is a plausible LoTL path, not evidence that it has occurred for every attack.
NetworkUnauthenticatedRemote code executionDenial of serviceCWE-787Public exploit reference
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

CERT-FR · French · CERTFR-2016-AVI-106Multiples vulnérabilités dans les produits Apple

.cve.org/CVERecord?id=CVE-2009-2197 Référence CVE CVE-2014-9495 https://www.cve.org/CVERecord?id=CVE-2014-9495 Référence CVE CVE-2015-0973 https://www.cve.org/CVERecord?id=CVE-2015-0973 Référence CVE CVE-2015-1819 https://www.cve.org/CVERecord?id=CVE-2015-1819 Référence CVE CVE-2015-3184 https://www.cve.org/CVERecord?id=CVE-2015-3184 Référence CVE CVE-2015-3187 https://www.cve.org/CVERecord?id=CVE-2015-3187 Référence CVE CVE-2015-3195 https://www.cve.org/CVERecord?id=CVE-2015-3195 Référence CVE CVE-2015-5312 https://www.cve.org/CVERecord?id=CVE-2015-5312 Référence CVE CVE-2015-5333 https://www.cve.org/CVERecord?id=CVE-2015-5333 Référence CVE CVE-2015-5334 https://www.cve.org/CVERecord?id=CVE-2015-5334 Référence CVE CVE-2015-7499 https://www.cve.org/CVERecord?id=CVE-2015-7499 Référence CVE CVE-2015-7500 https://www.cve.org/CVERecord?id=CVE-2015-7500 Référence CVE CVE-2015-7551 https://www.cve.org/CVERecord?id=CVE-2015-7551 Référence CVE CVE-2015-7942 https://www.cve.org/CVERecord?id=CVE-2015-7942 Référence CVE CVE-2015-7995 https://www.cve.org/CVERecord?id=CVE-2015-7995 Référence CVE CVE-2015-8035 https://www.cve.org/CVERecord?id=CVE-2015-8035 Référence CVE CVE-2015-8126 https://www.cve.org/CVERecord?id=CVE-2015-8126 Référence CVE CVE-2015-8242 https://www.cve.org/CVERecord?id=CVE-2015-8242 Ré

Official advisory ↗
CERT-FR · French · CERTFR-2015-AVI-534Multiples vulnérabilités dans Apple OS X

de l'éditeur pour l'obtention des correctifs (cf. section Documentation). Documentation Bulletin de sécurité Apple HT205637 du 08 décembre 2015 https://support.apple.com/en-us/HT205637 Référence CVE CVE-2011-2895 https://www.cve.org/CVERecord?id=CVE-2011-2895 Référence CVE CVE-2012-0876 https://www.cve.org/CVERecord?id=CVE-2012-0876 Référence CVE CVE-2012-1147 https://www.cve.org/CVERecord?id=CVE-2012-1147 Référence CVE CVE-2012-1148 https://www.cve.org/CVERecord?id=CVE-2012-1148 Référence CVE CVE-2015-3807 https://www.cve.org/CVERecord?id=CVE-2015-3807 Référence CVE CVE-2015-5333 https://www.cve.org/CVERecord?id=CVE-2015-5333 Référence CVE CVE-2015-5334 https://www.cve.org/CVERecord?id=CVE-2015-5334 Référence CVE CVE-2015-6908 https://www.cve.org/CVERecord?id=CVE-2015-6908 Référence CVE CVE-2015-7001 https://www.cve.org/CVERecord?id=CVE-2015-7001 Référence CVE CVE-2015-7038 https://www.cve.org/CVERecord?id=CVE-2015-7038 Référence CVE CVE-2015-7039 https://www.cve.org/CVERecord?id=CVE-2015-7039 Référence CVE CVE-2015-7040 https://www.cve.org/CVERecord?id=CVE-2015-7040 Référence CVE CVE-2015-7041 https://www.cve.org/CVERecord?id=CVE-2015-7041 Référence CVE CVE-2015-7042 https://www.cve.org/CVERecord?id=CVE-2015-7042 Référence CVE CVE-2015-7043 https://www.cve.org/CVERecord?id=CVE-2015-7043 Ré

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2015-008548LibreSSL における境界外書き込みに関する脆弱性

LibreSSL には、境界外書き込みに関する脆弱性が存在します。 本脆弱性は、CVE-2014-3508 に対する修正が不完全だったことに起因する脆弱性です。

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Fix not verified
Affected
LibreSSL: before 2.3.1
Fixed
No fixed version is explicitly recorded in the structured CVE data.
Action
No verified patch reference is present in the current structured sources. Check the vendor advisory before making a change.
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
Official vendor articles2 stored documents

Linked articles are downloaded and versioned as source evidence. A CVE mention or approved update relationship does not, by itself, verify a fix for every product branch.

04

Evidence and provenance

Published 23 Jan 2020 · Last source change 6 Aug 2024, 06:41 UTC · CWE-787 · Out-of-bounds Write

CVE recordCVE.org · 5.1
CVSS sourceNIST NVD
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2015-5304
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceNIST NVD
NVD statusNVD modified after enrichment

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗

No material field changes have been recorded since change tracking began. Routine source refreshes and cosmetic edits are intentionally excluded.

Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
ENISA EUVD · EUVD-2015-5304↗Vendor advisory↗Public exploit reference↗Public exploit reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2015-5334 · cve.blacktree.nl