CVE-2026-24061
telnetd in GNU Inetutils through 2.7 allows remote authentication bypass via a "-f root" value for the USER environment variable.
02 Description
telnetd in GNU Inetutils through 2.7 allows remote authentication bypass via a "-f root" value for the USER environment variable.
03 Exploitation and scoring
- Exploitation
- Exploited in the wild. Listed in the CISA Known Exploited Vulnerabilities catalog on 2026-01-26. Federal remediation due 2026-02-16.
- SSVC decision
- ExploitationactiveCISA reports credible evidence of active exploitation.
- AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
- Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.
- EPSS probability
- 98.98% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 99.9% of scored records. A rank, not a probability.
- NVD base score
- 9.8 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- NVD analysis status
- Analyzed. NVD last modified this record on 2026-09-30.
- Red Hat severity
- No Red Hat rating. Red Hat rates the CVEs that affect its products.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2026-01-21 06:42Z9 MO AGO
- Last updated
- 2026-09-29 19:43Z29 DAYS AGO
- Reserved
- 2026-01-21
- Assigning CNA
- mitre
- Record state
- PUBLISHED
- Severity
- Critical (CVSS 9.8)
- CNA CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weaknesses
- CWE-88Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')Base
- Data version
- 5.2
- Document digest
- 5effde2e9052c61c953cfd1ed2b78aa21f358e977bdeba24ec4de0598cff1960
05 Affected products
06 References
- www.openwall.comhttps://www.openwall.com/lists/oss-security/2026/01/20/2
- www.openwall.comhttps://www.openwall.com/lists/oss-security/2026/01/20/8
- www.gnu.orghttps://www.gnu.org/software/inetutils/
- lists.gnu.orghttps://lists.gnu.org/archive/html/bug-inetutils/2026-01/msg00004.html
- codeberg.orghttps://codeberg.org/inetutils/inetutils/commit/fd702c02497b2f398e739e3119bed0b23dd7aa7b
- codeberg.orghttps://codeberg.org/inetutils/inetutils/commit/ccba9f748aa8d50a38d7748e2e60362edd6a32cc
- www.vicarius.iohttps://www.vicarius.io/vsociety/posts/cve-2026-24061-detection-script-remote-authentication-bypass-in-gnu-inetutils-package
- www.vicarius.iohttps://www.vicarius.io/vsociety/posts/cve-2026-24061-mitigation-script-remote-authentication-bypass-in-gnu-inetutils-package
- redteam.aehttps://redteam.ae/blog/cve-2026-24061-inetutils-telnetd-root-bypass
- www.openwall.comhttps://www.openwall.com/lists/oss-security/2026/01/20/2#:~:text=root@...a%3A~%20USER='
- www.labs.greynoise.iohttps://www.labs.greynoise.io/grimoire/2026-01-22-f-around-and-find-out-18-hours-of-unsolicited-houseguests/index.html
- www.cisa.govhttps://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-24061
- www.openwall.comhttp://www.openwall.com/lists/oss-security/2026/01/22/1
- lists.debian.orghttps://lists.debian.org/debian-lts-announce/2026/01/msg00025.html
07 Fixed in
Debian 12
- inetutils Fixed in 2:2.4-2+deb12u2
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- inetutils Fixed in 2:2.6-3+deb13u1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- inetutils Fixed in 2:2.7-2
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 22.04 LTS
- inetutils Fixed in 2:2.2-2ubuntu0.2
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 24.04 LTS
- inetutils Fixed in 2:2.5-3ubuntu4.1
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 25.10
- inetutils Fixed in 2:2.6-1ubuntu3.1
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 16.04 LTS
- inetutils Fixed in 2:1.9.4-1ubuntu0.1~esm5Available with Ubuntu Pro: https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 18.04 LTS
- inetutils Fixed in 2:1.9.4-3ubuntu0.1+esm4Available with Ubuntu Pro: https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 20.04 LTS
- inetutils Fixed in 2:1.9.4-11ubuntu0.2+esm3Available with Ubuntu Pro: https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.