What is CVE-2021-42917?

CVE-2021-42917 is a medium-severity vulnerability in Kodi, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 5.5/10. Published 2021-11-01.

How severe is CVE-2021-42917?

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

Buffer overflow in Kodi

CVE-2021-42917

Buffer overflow vulnerability in Kodi xbmc up to 19.0, allows attackers to cause a denial of service due to improper length of values passed to istream.

Vulnerability class: Buffer Overflow

Published 2021-11-01 · 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: 0.019 (78.9th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 79th percentile — 78.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.019 · newest: 0.019 · change: -0.000

Affected products

Kodi

Weakness classification (CWE)

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

References

github.com/xbmc/xbmc/issues/20305 (Exploit, Third Party Advisory, Issue Tracking)
github.com/xbmc/xbmc/pull/20306 (Patch, Third Party Advisory)
github.com/fuzzard/xbmc/commit/80c8138c09598e88b4ddb6dbb279fa193bbb3237 (Patch, Third Party Advisory)
github.com/xbmc/xbmc/commit/48730b64494798705d46dfccc4029bd36d072df3 (Patch, Third Party Advisory)
lists.debian.org/debian-lts-announce/2024/01/msg00009.html (mailing-list)

Frequently asked questions

What is CVE-2021-42917?: CVE-2021-42917 is a medium-severity vulnerability in Kodi, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 5.5/10. Published 2021-11-01.
How severe is CVE-2021-42917?: Medium severity. CVSS v3 base score is 5.5 out of 10.