CVE-2015-5334Public exploitNetwork attack vector

Process crash or code execution via terminator overrun

Published Jan 23, 2020 · Updated Aug 6, 2024

Stack-based buffer overflow in LibreSSL before 2.3.1 allows remote attackers to crash processes or execute arbitrary code. When the output buffer is exhausted, OBJ_obj2txt error handling writes a NUL byte through buf[0] after buf has advanced beyond the buffer. Certificate decoding reaches the function automatically on clients and on servers requesting client authentication; versions 2.0.5 and later require a BIGNUM allocation failure to enter the final error path.

CVSS severity9.8
Critical
EPSS probability3.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in LibreSSL before 2.3.1 allows remote attackers to crash processes or execute arbitrary code. When the output buffer is exhausted, OBJ_obj2txt error handling writes a NUL byte through buf[0] after buf has advanced beyond the buffer. Certificate decoding reaches the function automatically on clients and on servers requesting client authentication; versions 2.0.5 and later require a BIGNUM allocation failure to enter the final error path.

The record

CVE
CVE-2015-5334
Published
Jan 23, 2020
Updated
Aug 6, 2024
Vendor
OpenBSD Project
Product
LibreSSL
Classifications
CWE-787, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 23, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 6, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=before 2.3.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OpenBSD Project · LibreSSLversion=before 2.3.1

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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