VulnerabilityModified
CVE-2025-26465
A vulnerability was found in OpenSSH when the VerifyHostKeyDNS option is enabled.
MEDIUM 6.8EPSS 7.58%
Does this matter?
Lower severity and a low EPSS score (7.58%). Track it; it rarely justifies an emergency change on its own.
Description
A vulnerability was found in OpenSSH when the VerifyHostKeyDNS option is enabled. A machine-in-the-middle attack can be performed by a malicious machine impersonating a legit server. This issue occurs due to how OpenSSH mishandles error codes in specific conditions when verifying the host key. For an attack to be considered successful, the attacker needs to manage to exhaust the client's memory resource first, turning the attack complexity high.
- CVSS 3.1
- 6.8 MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
- EPSS
- 7.58% probability · 94th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-390
- Affected
- openbsd/openssh · netapp/active iq unified manager · netapp/ontap · redhat/openshift container platform · debian/debian linux · redhat/enterprise linux
- Source
- secalert@redhat.com
References
- https://access.redhat.com/errata/RHSA-2025:16823
- https://access.redhat.com/errata/RHSA-2025:3837
- https://access.redhat.com/errata/RHSA-2025:6993
- https://access.redhat.com/errata/RHSA-2025:8385
- https://access.redhat.com/security/cve/CVE-2025-26465Third Party Advisory
- https://access.redhat.com/solutions/7109879
- https://bugzilla.redhat.com/show_bug.cgi?id=2344780Issue Tracking, Third Party Advisory
- https://seclists.org/oss-sec/2025/q1/144Mailing List, Third Party Advisory
- http://seclists.org/fulldisclosure/2025/Feb/18
- http://seclists.org/fulldisclosure/2025/May/7
- http://seclists.org/fulldisclosure/2025/May/8
- https://blog.qualys.com/vulnerabilities-threat-research/2025/02/18/qualys-tru-discovers-two-vulnerabilities-in-openssh-cve-2025-26465-cve-2025-26466Third Party Advisory
- https://bugzilla.suse.com/show_bug.cgi?id=1237040Issue Tracking
- https://ftp.openbsd.org/pub/OpenBSD/patches/7.6/common/008_ssh.patch.sigPatch
- https://lists.debian.org/debian-lts-announce/2025/02/msg00020.htmlThird Party Advisory
- https://lists.mindrot.org/pipermail/openssh-unix-announce/2025-February/000161.htmlThird Party Advisory
- https://security-tracker.debian.org/tracker/CVE-2025-26465Third Party Advisory
- https://security.netapp.com/advisory/ntap-20250228-0003/Third Party Advisory
- https://ubuntu.com/security/CVE-2025-26465Third Party Advisory
- https://www.openssh.com/releasenotes.html#9.9p2Release Notes
- https://www.openwall.com/lists/oss-security/2025/02/18/1Mailing List, Third Party Advisory
- https://www.openwall.com/lists/oss-security/2025/02/18/4Mailing List, Third Party Advisory
- https://www.theregister.com/2025/02/18/openssh_vulnerabilities_mitm_dos/Press/Media Coverage
- https://www.vicarius.io/vsociety/posts/cve-2025-26465-detect-vulnerable-opensshThird Party Advisory
- https://www.vicarius.io/vsociety/posts/cve-2025-26465-mitigate-vulnerable-opensshMitigation, Third Party Advisory
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html
- https://cert-portal.siemens.com/productcert/html/ssa-585531.html
- https://seclists.org/oss-sec/2025/q1/144Mailing List, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.