Skip to content
Fencer Vulns
critical 9.8

CVE-2020-24916 in the critical feed json

CGI implementation in Yaws web server versions 1.81 to 2.0.7 is vulnerable to OS command injection.

published 2020-09-09 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-17621

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
17.4%
EPSS 17.4% chance of exploitation in 30 days, percentile 97%
public exploits
0
none known

Summary

CGI implementation in Yaws web server versions 1.81 to 2.0.7 is vulnerable to OS command injection.

Patch / fix

  • yaws Debian 14, Debian 13, Debian 12 2.0.8+dfsg-1

debian advisories DEBIAN-CVE-2020-24916

  • yaws Ubuntu 18.04 LTS 2.0.4+dfsg-2ubuntu0.1
  • yaws Ubuntu Pro 16.04 LTS 2.0.2-1ubuntu0.1~esm1
  • yaws Ubuntu Pro 20.04 LTS 2.0.7+dfsg-1ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2020-24916

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

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-2020-24916 updated cvss 6.3

yaws: OS command injection possible in CGI implementation

  • Red Hat All currently supported Red Hat products
    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

17.37% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • packetstormsecurity.com https://packetstormsecurity.com/files/159106/Yaws-2.0.7-XML-Injection-Command-Injection.html referenced PoC, tagged "exploit" by a source, unverified
  • vuln.be https://vuln.be/post/yaws-xxe-and-shell-injections/ referenced PoC, tagged "exploit" by a source, unverified
  • github.com https://github.com/vulnbe/poc-yaws-cgi-shell-injection referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 10.0 AV:N/AC:L/Au:N/C:C/I:C/A:C

Classification

Weakness
  • CWE-78 Improper Neutralization of Special Elements used in an OS Command

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.