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Vulnerability record · CVE-2021-40491 · published 3 September 2021

CVE-2021-40491: Gnu inetutils insufficient verification of data authenticity vulnerability

Gnu · Inetutils

The ftp client in GNU Inetutils before 2.2 does not validate addresses returned by PASV/LSPV responses to make sure they match the server address. This is similar to CVE-2020-8284 for curl.

6.5 CVSS 3.1 Medium EPSS 1.0% · top 37.7% CWE-345 · Insufficient verification of data authenticity
6.5CVSS 3.1 base score, v2 4.3
1.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

Description

The ftp client in GNU Inetutils before 2.2 does not validate addresses returned by PASV/LSPV responses to make sure they match the server address. This is similar to CVE-2020-8284 for curl.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=993476 Third Party Advisory
https://git.savannah.gnu.org/cgit/inetutils.git/commit/?id=58cb043b190fd04effdaea7c9403416b436e50dd PatchVendor Advisory
https://lists.debian.org/debian-lts-announce/2022/11/msg00033.html Mailing ListThird Party Advisory
https://lists.gnu.org/archive/html/bug-inetutils/2021-06/msg00002.html Mailing ListVendor Advisory
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=993476 Third Party Advisory
https://git.savannah.gnu.org/cgit/inetutils.git/commit/?id=58cb043b190fd04effdaea7c9403416b436e50dd PatchVendor Advisory
https://lists.debian.org/debian-lts-announce/2022/11/msg00033.html Mailing ListThird Party Advisory
https://lists.gnu.org/archive/html/bug-inetutils/2021-06/msg00002.html Mailing ListVendor Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-40491), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.