OpenSSH 9.5 through 9.7 before 9.8 sometimes allows timing attacks against echo-off…
Priority LOW 38CWE-367Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA.
Summary
OpenSSH 9.5 through 9.7 before 9.8 sometimes allows timing attacks against echo-off password entry (e.g., for su and Sudo) because of an ObscureKeystrokeTiming logic error. Similarly, other timing attacks against keystroke entry could occur.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01634 76th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
Not affected: 6 products
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4
Timeline
- 2026-10-02 Threatist record created from CVE-2024-39894
- 2026-10-03 Alias added: GHSA-g5qj-pfmg-p3jp
References
Other 10
- https://www.openssh.com/txt/release-9.8
- https://lists.mindrot.org/pipermail/openssh-unix-announce/2024-July/000158.html
- https://www.openwall.com/lists/oss-security/2024/07/02/1
- [oss-security] 20240703 Re: Announce: OpenSSH 9.8 released
- https://security.netapp.com/advisory/ntap-20240712-0004/
- [oss-security] 20240723 Re: linux-distros application for CentOS Project's Hyperscale SIG
- [oss-security] 20240723 Re: linux-distros application for CentOS Project's Hyperscale SIG
- [oss-security] 20240728 Re: Announce: OpenSSH 9.8 released
- https://crzphil.github.io/posts/ssh-obfuscation-bypass/
- https://news.ycombinator.com/item?id=41508530
Sources
- CVE-2024-39894 · CVE Program
- CVE-2024-39894 · NVD
- FIRST EPSS
- GHSA-g5qj-pfmg-p3jp · GitHub Advisory Database · CC BY 4.0
- CVE-2024-39894 · Red Hat security data · CC BY 4.0
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