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Vulnerability details: VCID-th1a-kew9-mfc9
Vulnerability ID VCID-th1a-kew9-mfc9
Aliases CVE-2021-40491
Summary 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.
Status Published
Exploitability 0.5
Weighted Severity 5.9
Risk 3.0
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-345 Insufficient Verification of Data Authenticity
System Score Found at
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-40491
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-40491
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-40491
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-40491
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-40491
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-40491
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-40491
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-40491
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-40491
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-40491
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-40491
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-40491
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-40491
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-40491
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-40491
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-40491
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-40491
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-40491
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-40491
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-40491
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-40491
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-40491
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-40491
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-40491
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-40491
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-40491
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-40491
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-40491
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-40491
cvssv2 4.3 https://nvd.nist.gov/vuln/detail/CVE-2021-40491
cvssv3.1 6.5 https://nvd.nist.gov/vuln/detail/CVE-2021-40491
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2021-40491
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=993476
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-40491
https://git.savannah.gnu.org/cgit/inetutils.git/commit/?id=58cb043b190fd04effdaea7c9403416b436e50dd
https://lists.debian.org/debian-lts-announce/2022/11/msg00033.html
https://lists.gnu.org/archive/html/bug-inetutils/2021-06/msg00002.html
cpe:2.3:a:gnu:inetutils:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:gnu:inetutils:*:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
CVE-2021-40491 https://nvd.nist.gov/vuln/detail/CVE-2021-40491
USN-USN-5177-1 https://usn.ubuntu.com/USN-5177-1/
No exploits are available.
Vector: AV:N/AC:M/Au:N/C:P/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-40491
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-40491
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.53086
EPSS Score 0.00302
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:42:58.061002+00:00 Ubuntu USN Importer Import https://usn.ubuntu.com/USN-5177-1/ 37.0.0