Memory leak in the OBJ_obj2txt function in LibreSSL before 2.3.1 allows remote attackers to cause a denial of service (memory consumption)…

published 2020-01-23 6 y ago modified 2026-06-17 4 mo ago also EUVD-2015-5303

cvss: 7.5; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 2.0%; EPSS 2.0% chance of exploitation in 30 days, percentile 80%
public exploits: 0; none known

Memory leak in the OBJ_obj2txt function in LibreSSL before 2.3.1 allows remote attackers to cause a denial of service (memory consumption) via a large number of ASN.1 object identifiers in X.509 certificates.

Patch / fix

fixed in 1 distros 1

openbsd libressl 2.3.1

libressl openSUSE Tumbleweed 2.5.0-1.1

opensuse advisories openSUSE-SU-2024:10309-1

Exploit prediction

1.98% chance of exploitation in the next 30 days, higher than 80% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

packetstormsecurity.com http://packetstormsecurity.com/files/133998/Qualys-Security-Advisory-LibreSSL-Leak-Overflow.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

LibreSSL LibreSSL

Classification

Weakness

CWE-400 Uncontrolled Resource Consumption

References

packetstormsecurity.com /files/133998/Qualys-Security-Advisory-LibreSSL-Leak-Overflow.html
exploit, third-party-advisory, vdb-entry
ftp.openbsd.org /pub/OpenBSD/LibreSSL/libressl-2.3.1-relnotes.txt
release-notes, vendor-advisory
securityfocus.com /archive/1/archive/1/536692/100/0/threaded
broken-link
lists.opensuse.org /opensuse-updates/2015-10/msg00050.html
mailing-list, third-party-advisory

Sources

CVE List CVE-2015-5333
NVD CVE-2015-5333

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary