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Fencer Vulns
medium 6.5

CVE-2020-18652 json

Buffer Overflow vulnerability in WEBP_Support.cpp in exempi 2.5.0 and earlier allows remote attackers to cause a denial of service via open…

published 2023-08-22 3 y ago modified 2026-06-17 4 mo ago also EUVD-2020-10576

cvss
6.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.0%
EPSS 1.0% chance of exploitation in 30 days, percentile 63%
public exploits
0
none known

Summary

Buffer Overflow vulnerability in WEBP_Support.cpp in exempi 2.5.0 and earlier allows remote attackers to cause a denial of service via opening of crafted webp file.

Patch / fix

  • exempi Debian 14, Debian 13, Debian 12 2.5.1-1

debian advisories DEBIAN-CVE-2020-18652

  • exempi RHEL 8 2.4.5-4.el8

red hat advisories RHSA-2024:3066

  • exempi SLE Module for Desktop Applications 15 SP5, SLE Module for Desktop Applications 15 SP4, openSUSE Leap 15.5 +1 more 2.4.5-150000.3.6.1

suse advisories SUSE-SU-2023:3518-1

  • exempi AlmaLinux 8 2.4.5-4.el8

almalinux advisories ALSA-2024:3066

  • exempi Rocky Linux 8 2.4.5-4.el8

rocky linux advisories RLSA-2024:3066

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-18652 updated cvss 6.5

exempi: denial of service via opening of crafted webp file

  • Red Hat Enterprise Linux 6 exempi Red Hat Enterprise Linux 7 exempi
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 8) exempi 2.4.5-4.el8 Red Hat Enterprise Linux CRB (v. 8) exempi-devel 2.4.5-4.el8, exempi-debuginfo 2.4.5-4.el8, exempi-debugsource 2.4.5-4.el8
    fixed: vendor fix RHSA-2024:3066
  • Red Hat Enterprise Linux 9 exempi
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

1.00% chance of exploitation in the next 30 days, higher than 63% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • gitlab.freedesktop.org https://gitlab.freedesktop.org/libopenraw/exempi/issues/12 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.