What is CVE-2021-39283?

CVE-2021-39283 is a medium-severity vulnerability in Live555, classified under Reachable Assertion. CVSS score: 5.5/10. Published 2021-08-18.

How severe is CVE-2021-39283?

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

Vulnerability in Live555

CVE-2021-39283

liveMedia/FramedSource.cpp in Live555 through 1.08 allows an assertion failure and application exit via multiple SETUP and PLAY commands.

Published 2021-08-18 · 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: 0.009 (57.0th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 57.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Live555

Weakness classification (CWE)

CWE-617 — Reachable Assertion

References

www.live555.com/liveMedia/public/changelog.txt
lists.live555.com/pipermail/live-devel/2021-August/021969.html (Exploit, Mailing List, Vendor Advisory)

Frequently asked questions

What is CVE-2021-39283?: CVE-2021-39283 is a medium-severity vulnerability in Live555, classified under Reachable Assertion. CVSS score: 5.5/10. Published 2021-08-18.
How severe is CVE-2021-39283?: Medium severity. CVSS v3 base score is 5.5 out of 10.