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Fencer Vulns
low 3.3

CVE-2020-18442 json

Infinite Loop in zziplib v0.13.69 allows remote attackers to cause a denial of service via the return value "zzip_file_read" in the functio…

published 2021-06-18 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-10366

cvss
3.3
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 55%
public exploits
0
none known

Summary

Infinite Loop in zziplib v0.13.69 allows remote attackers to cause a denial of service via the return value "zzip_file_read" in the function "unzzip_cat_file".

Patch / fix

  • zziplib Debian 14, Debian 13, Debian 12 0.13.72+dfsg.1-1

debian advisories DEBIAN-CVE-2020-18442

  • zziplib Ubuntu 20.04 LTS 0.13.62-3.2ubuntu1.1
  • zziplib Ubuntu Pro 16.04 LTS 0.13.62-3ubuntu0.16.04.2+esm1
  • zziplib Ubuntu Pro 18.04 LTS 0.13.62-3.1ubuntu0.18.04.1+esm1

ubuntu advisories UBUNTU-CVE-2020-18442

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • zziplib RHEL 8 0.13.68-9.el8
  • zziplib-utils RHEL 8 0.13.68-9.el8

red hat advisories RHSA-2021:4316

  • zziplib SLES 15 SP4-TERADATA, SLE Module for Basesystem 15 SP5, openSUSE Leap 15.5 0.13.69-150000.3.17.1
  • zziplib SLE Workstation Extension 12 SP5, SLE Software Development Kit 12 SP5 0.13.67-10.33.1

suse advisories SUSE-SU-2024:0970-1SUSE-SU-2021:2164-1

  • zziplib AlmaLinux 8 0.13.68-9.el8
  • zziplib-utils AlmaLinux 8 0.13.68-9.el8

almalinux advisories ALSA-2021:4316

  • zziplib Rocky Linux 8 0.13.68-9.el8

rocky linux advisories RLSA-2021:4316

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-2020-18442 updated cvss 3.3

zziplib: infinite loop via the return value of zzip_file_read() as used in unzzip_cat_file()

  • Red Hat CodeReady Linux Builder (v. 8) zziplib-devel 0.13.68-9.el8, zziplib-debuginfo 0.13.68-9.el8, zziplib-debugsource 0.13.68-9.el8, zziplib-utils-debuginfo 0.13.68-9.el8 Red Hat Enterprise Linux AppStream (v. 8) zziplib 0.13.68-9.el8, zziplib-utils 0.13.68-9.el8
    fixed: vendor fix RHSA-2021:4316
  • Red Hat Enterprise Linux 7 zziplib, zziplib-utils Red Hat Enterprise Linux 9 zziplib, zziplib-utils
    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

Exploit prediction

0.74% chance of exploitation in the next 30 days, higher than 55% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/gdraheim/zziplib/issues/68 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 3.3 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
NVD 2.0 2.1 AV:L/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness
  • CWE-835 Loop with Unreachable Exit Condition

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.