What is CVE-2021-45863?

CVE-2021-45863 is a medium-severity vulnerability in Tsmuxer Project, classified under Out-of-bounds Write. CVSS score: 5.5/10. Published 2022-03-02.

How severe is CVE-2021-45863?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Buffer overflow in Tsmuxer Project

CVE-2021-45863

tsMuxer git-2678966 was discovered to contain a heap-based buffer overflow via the function HevcUnit::updateBits in hevc.cpp.

Vulnerability class: Buffer Overflow

Published 2022-03-02 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.007 (52.4th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 52.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Tsmuxer Project

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

github.com/justdan96/tsMuxer/issues/509 (Exploit, Patch, Third Party Advisory, Issue Tracking)
github.com/justdan96/tsMuxer/pull/512 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-45863?: CVE-2021-45863 is a medium-severity vulnerability in Tsmuxer Project, classified under Out-of-bounds Write. CVSS score: 5.5/10. Published 2022-03-02.
How severe is CVE-2021-45863?: Medium severity. CVSS v3 base score is 5.5 out of 10.