What is CVE-2021-35346?

CVE-2021-35346 is a critical-severity vulnerability in Tsmuxer Project, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2021-12-03.

How severe is CVE-2021-35346?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2021-35346 known to be exploited?

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

Buffer overflow in Tsmuxer Project

CVE-2021-35346

tsMuxer v2.6.16 was discovered to contain a heap-based buffer overflow via the function HevcSpsUnit::short_term_ref_pic_set(int) in hevc.cpp.

Vulnerability class: Buffer Overflow

Published 2021-12-03 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.018 (78.0th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 78th percentile — 78.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.017 · newest: 0.018 · change: +0.001

Affected products

Tsmuxer Project — versions 2.6.16

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

Public proof-of-concept exploits

References

github.com/justdan96/tsMuxer/pull/422/files (Patch, Third Party Advisory)
github.com/justdan96/tsMuxer/issues/436 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-35346?: CVE-2021-35346 is a critical-severity vulnerability in Tsmuxer Project, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2021-12-03.
How severe is CVE-2021-35346?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2021-35346 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.