What is CVE-2021-3474?

CVE-2021-3474 is a medium-severity vulnerability in Openexr, classified under Integer Overflow or Wraparound. CVSS score: 5.3/10. Published 2021-03-30.

How severe is CVE-2021-3474?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Integer overflow in Openexr

CVE-2021-3474

There's a flaw in OpenEXR in versions before 3.0.0-beta. A crafted input file that is processed by OpenEXR could cause a shift overflow in the FastHufDecoder, potentially leading to problems with application availability.

Vulnerability class: Integer Overflow

Published 2021-03-30 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.018 (78.2th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 78th percentile — 78.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.018 · newest: 0.018 · change: 0.000

Affected products

Openexr
Debian Linux — versions 9.0, 10.0
Openexr — versions OpenEXR 3.0.0-beta

Weakness classification (CWE)

CWE-190 — Integer Overflow or Wraparound

References

bugzilla.redhat.com/show_bug.cgi (Patch, Third Party Advisory, Issue Tracking)
bugs.chromium.org/p/oss-fuzz/issues/detail (Mailing List, Third Party Advisory, Issue Tracking)
lists.debian.org/debian-lts-announce/2021/07/msg00001.html (mailing-list, Mailing List, Third Party Advisory)
security.gentoo.org/glsa/202107-27 (vendor-advisory, Third Party Advisory)
lists.debian.org/debian-lts-announce/2022/12/msg00022.html (mailing-list, Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2021-3474?: CVE-2021-3474 is a medium-severity vulnerability in Openexr, classified under Integer Overflow or Wraparound. CVSS score: 5.3/10. Published 2021-03-30.
How severe is CVE-2021-3474?: Medium severity. CVSS v3 base score is 5.3 out of 10.