What is CVE-2022-29242?

CVE-2022-29242 is a medium-severity vulnerability in Gost-Engine Engine, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 5.9/10. Published 2022-05-24.

How severe is CVE-2022-29242?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Is CVE-2022-29242 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Gost-Engine Engine

CVE-2022-29242

GOST engine is a reference implementation of the Russian GOST crypto algorithms for OpenSSL. TLS clients using GOST engine when ciphersuite `TLS_GOSTR341112_256_WITH_KUZNYECHIK_CTR_OMAC` is agreed and the server uses 512 bit GOST secret keys are vulnerable to buffer overflow. GOST engine version 3.0.1 contains a patch for this issue. Disabling ciphersuite `TLS_GOSTR341112_256_WITH_KUZNYECHIK_CTR_OMAC` is a possible workaround.

Vulnerability class: Buffer Overflow

Published 2022-05-24 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.017 (76.1th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 76th percentile — 76.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.016 · newest: 0.017 · change: +0.000

Affected products

Gost-Engine Engine — versions < 3.0.1
Gost Engine Project

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

Public proof-of-concept exploits

References

github.com/gost-engine/engine/security/advisories/GHSA-2rmw-8wpg-vgw5 (Third Party Advisory)
github.com/gost-engine/engine/commit/7df766124f87768b43b9e8947c5a01e17545772c (Patch, Third Party Advisory)
github.com/gost-engine/engine/commit/b2b4d629f100eaee9f5942a106b1ccefe85b8808 (Patch, Third Party Advisory)
github.com/gost-engine/engine/commit/c6655a0b620a3e31f085cc906f8073fe81b2fad3 (Patch, Third Party Advisory)
github.com/gost-engine/engine/releases/tag/v3.0.1 (Third Party Advisory, Release Notes)

Frequently asked questions

What is CVE-2022-29242?: CVE-2022-29242 is a medium-severity vulnerability in Gost-Engine Engine, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 5.9/10. Published 2022-05-24.
How severe is CVE-2022-29242?: Medium severity. CVSS v3 base score is 5.9 out of 10.
Is CVE-2022-29242 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.