What is CVE-2020-18773?

CVE-2020-18773 is a medium-severity vulnerability in Exiv2, classified under Out-of-bounds Write. CVSS score: 6.5/10. Published 2021-08-23.

How severe is CVE-2020-18773?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Buffer overflow in Exiv2

CVE-2020-18773

An invalid memory access in the decode function in iptc.cpp of Exiv2 0.27.99.0 allows attackers to cause a denial of service (DOS) via a crafted tif file.

Vulnerability class: Buffer Overflow

Published 2021-08-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.013 (70.0th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 70th percentile — 70.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

Exiv2 — versions 0.27.99.0

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

github.com/Exiv2/exiv2/issues/760 (Exploit, Third Party Advisory)
security.gentoo.org/glsa/202312-06 (vendor-advisory)

Frequently asked questions

What is CVE-2020-18773?: CVE-2020-18773 is a medium-severity vulnerability in Exiv2, classified under Out-of-bounds Write. CVSS score: 6.5/10. Published 2021-08-23.
How severe is CVE-2020-18773?: Medium severity. CVSS v3 base score is 6.5 out of 10.