What is CVE-2015-5333?

CVE-2015-5333 is a high-severity vulnerability in Libressl, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2020-01-23.

How severe is CVE-2015-5333?

High severity. CVSS v3 base score is 7.5 out of 10.

Resource exhaustion in Libressl

CVE-2015-5333

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.

Vulnerability class: DoS (Denial of Service)

Published 2020-01-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.020 (79.7th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 80th percentile — 79.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.020 · newest: 0.020 · change: 0.000

Affected products

Libressl — versions before 2.3.1
OpenBSD Libressl
openSUSE — versions 13.2

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

References

packetstormsecurity.com/files/133998/Qualys-Security-Advisory-LibreSSL-Leak-Ove… (Exploit, VDB Entry, Third Party Advisory)
ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-2.3.1-relnotes.txt (Release Notes, Vendor Advisory)
www.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)

Frequently asked questions

What is CVE-2015-5333?: CVE-2015-5333 is a high-severity vulnerability in Libressl, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2020-01-23.
How severe is CVE-2015-5333?: High severity. CVSS v3 base score is 7.5 out of 10.