Red Hat Enterprise Linux 10: Return of Wrong Status Code
CVE-2025-5987 is a high-severity return of wrong status code vulnerability in Red Hat Enterprise Linux 10 from Red Hat, with a CVSS 3.1 base score of 8.1 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. There is no confirmed exploitation so far. EPSS estimates a 1.73% chance of exploitation within 30 days, higher than 78% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Libssh to 0.11.2 or a later version.
- Read the advisory on libssh.org for workarounds and exact fixed builds.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- HighSuccess depends on conditions outside the attacker's control.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 8.1 | High | CNA (redhat.com) |
| CVSS 3.1 | 8.1 | High | NVD |
Official description
A flaw was found in libssh when using the ChaCha20 cipher with the OpenSSL library. If an attacker manages to exhaust the heap space, this error is not detected and may lead to libssh using a partially initialized cipher context. This occurs because the OpenSSL error code returned aliases with the SSH_OK code, resulting in libssh not properly detecting the error returned by the OpenSSL library. This issue can lead to undefined behavior, including compromised data confidentiality and integrity or crashes.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Return of Wrong Status Code
A function or operation returns an incorrect return value or status code that does not indicate the true result of execution, causing the product to modify its behavior based on the incorrect result.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Third-party and government advisories
- access.redhat.com/security/cve/CVE-2025-5987Third Party Advisory
- bugzilla.redhat.com/show_bug.cgi?id=2376219Issue Tracking, Third Party Advisory
Other references
- access.redhat.com/errata/RHSA-2025:23483
- access.redhat.com/errata/RHSA-2025:23484
- access.redhat.com/errata/RHSA-2026:0427
- access.redhat.com/errata/RHSA-2026:0428
- access.redhat.com/errata/RHSA-2026:0430
- access.redhat.com/errata/RHSA-2026:0431
- access.redhat.com/errata/RHSA-2026:0702
- access.redhat.com/errata/RHSA-2026:0978
- access.redhat.com/errata/RHSA-2026:0980
- access.redhat.com/errata/RHSA-2026:0985
- access.redhat.com/errata/RHSA-2026:0996
- access.redhat.com/errata/RHSA-2026:1539
- access.redhat.com/errata/RHSA-2026:1541
- access.redhat.com/errata/RHSA-2026:3415
Other vulnerabilities in Red Hat Enterprise Linux 10
- 8.8 High severity
- 7.5 High severity
- 7.5 High severity
- 7.9 High severity
- 7.3 High severity
- 7.5 High severity
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