CVE catalog

CVE-2024-39894

OpenSSH vulnerability

Severity: Medium · CVSS 5.9CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Published: Jul 2, 2024, 12:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 1.63% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	openssh	sid	`1:10.6p1-1`	fixed
Debian	openssh	forky	`1:10.6p1-1`	fixed
Debian	openssh	trixie	`1:10.0p1-7+deb13u4`	fixed
Debian	openssh	trixie-security	`1:10.0p1-7+deb13u2`	fixed
Debian	openssh	bookworm	`1:9.2p1-2+deb12u10`	not affected
Debian	openssh	bookworm-security	`1:9.2p1-2+deb12u9`	not affected
Ubuntu	openssh	noble	Not reported	not affected
Ubuntu	openssh	noble	`1:9.6p1-3ubuntu13.4`	fixed
Ubuntu	openssh-client	noble	`1:9.6p1-3ubuntu13.4`	fixed
Ubuntu	openssh-server	noble	`1:9.6p1-3ubuntu13.4`	fixed
Ubuntu	openssh-sftp-server	noble	`1:9.6p1-3ubuntu13.4`	fixed
Ubuntu	openssh-tests	noble	`1:9.6p1-3ubuntu13.4`	fixed
Ubuntu	ssh	noble	`1:9.6p1-3ubuntu13.4`	fixed
Ubuntu	ssh-askpass-gnome	noble	`1:9.6p1-3ubuntu13.4`	fixed
Ubuntu	openssh	24.04	`1:9.3p1-1ubuntu3`	vulnerable
Ubuntu	openssh	24.04	`1:9.4p1-1ubuntu1`	vulnerable
Ubuntu	openssh	24.04	`1:9.6p1-3ubuntu1`	vulnerable
Ubuntu	openssh	24.04	`1:9.6p1-3ubuntu2`	vulnerable
Ubuntu	openssh	24.04	`1:9.6p1-3ubuntu11`	vulnerable
Ubuntu	openssh	24.04	`1:9.6p1-3ubuntu12`	vulnerable
Ubuntu	openssh	24.04	`1:9.6p1-3ubuntu13`	vulnerable
Ubuntu	openssh	24.04	`1:9.6p1-3ubuntu13.3`	vulnerable
Ubuntu	openssh	24.04	`1:9.6p1-3ubuntu13.4`	fixed
Ubuntu	openssh	24.04	`1:9.3p1-1ubuntu3`	vulnerable
Ubuntu	openssh	24.04	`1:9.4p1-1ubuntu1`	vulnerable
Ubuntu	openssh	24.04	`1:9.6p1-3ubuntu1`	vulnerable
Ubuntu	openssh	24.04	`1:9.6p1-3ubuntu2`	vulnerable
Ubuntu	openssh	24.04	`1:9.6p1-3ubuntu11`	vulnerable
Ubuntu	openssh	24.04	`1:9.6p1-3ubuntu12`	vulnerable
Ubuntu	openssh	24.04	`1:9.6p1-3ubuntu13`	vulnerable
Ubuntu	openssh	24.04	`1:9.6p1-3ubuntu13.3`	vulnerable
Ubuntu	openssh	24.04	`1:9.6p1-3ubuntu13.4`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	openssh	source	sid	`1:9.8p1-1`	not yet assigned	Not reported	[1076764]
Debian	openssh	source	forky	`1:9.8p1-1`	not yet assigned	Not reported	[1076764]
Debian	openssh	source	trixie	`1:9.8p1-1`	not yet assigned	Not reported	[1076764]
Debian	openssh	source	bookworm	`Not affected`	unimportant	Not reported	[1076764]
Ubuntu	openssh	deb	noble	`1:9.6p1-3ubuntu13.4`	Not reported	Not reported	Not reported
Ubuntu	openssh-client	deb	noble	`1:9.6p1-3ubuntu13.4`	Not reported	Not reported	Not reported
Ubuntu	openssh-server	deb	noble	`1:9.6p1-3ubuntu13.4`	Not reported	Not reported	Not reported
Ubuntu	openssh-sftp-server	deb	noble	`1:9.6p1-3ubuntu13.4`	Not reported	Not reported	Not reported
Ubuntu	openssh-tests	deb	noble	`1:9.6p1-3ubuntu13.4`	Not reported	Not reported	Not reported
Ubuntu	ssh	deb	noble	`1:9.6p1-3ubuntu13.4`	Not reported	Not reported	Not reported
Ubuntu	ssh-askpass-gnome	deb	noble	`1:9.6p1-3ubuntu13.4`	Not reported	Not reported	Not reported
Ubuntu	openssh	deb	24.04	`1:9.6p1-3ubuntu13.4`	Not reported	USN-6887-1	Not reported
Ubuntu	openssh	deb	24.04	`1:9.6p1-3ubuntu13.4`	Not reported	UBUNTU-CVE-2024-39894	Not reported

[Debian bug #1076764]

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[openssh-client]Unknown
Source package: [openssh]
Details (8)
- 1:9.2p1-2+deb12u10 · amd64 · bookworm
  Not affected
  usn · openssh · debian · bookworm
- 1:9.2p1-2+deb12u10 · arm64 · bookworm
  Not affected
  usn · openssh · debian · bookworm
- 1:10.0p1-7~bpo12+1 · amd64 · bookworm-backports
  Not affected
  usn · openssh · debian · bookworm
- 1:10.0p1-7~bpo12+1 · arm64 · bookworm-backports
  Not affected
  usn · openssh · debian · bookworm
- 1:9.2p1-2+deb12u9 · amd64 · bookworm-security
  Not affected
  usn · openssh · debian · bookworm
- 1:9.2p1-2+deb12u9 · arm64 · bookworm-security
  Not affected
  usn · openssh · debian · bookworm
- 1:9.2p1-2+deb12u7 · amd64 · bookworm-updates
  Not affected
  usn · openssh · debian · bookworm
- 1:9.2p1-2+deb12u7 · arm64 · bookworm-updates
  Not affected
  usn · openssh · debian · bookworm
[openssh-client-gssapi]Unknown
Source package: [openssh]
Details (2)
- 1:10.0p1-7~bpo12+1 · all · bookworm-backports
  Not affected
  usn · openssh · debian · bookworm
- 1:10.0p1-7~bpo12+1 · all · bookworm-backports
  Not affected
  usn · openssh · debian · bookworm
[openssh-server]Unknown
Source package: [openssh]
Details (8)
- 1:9.2p1-2+deb12u10 · amd64 · bookworm
  Not affected
  usn · openssh · debian · bookworm
- 1:9.2p1-2+deb12u10 · arm64 · bookworm
  Not affected
  usn · openssh · debian · bookworm
- 1:10.0p1-7~bpo12+1 · amd64 · bookworm-backports
  Not affected
  usn · openssh · debian · bookworm
- 1:10.0p1-7~bpo12+1 · arm64 · bookworm-backports
  Not affected
  usn · openssh · debian · bookworm
- 1:9.2p1-2+deb12u9 · amd64 · bookworm-security
  Not affected
  usn · openssh · debian · bookworm
- 1:9.2p1-2+deb12u9 · arm64 · bookworm-security
  Not affected
  usn · openssh · debian · bookworm
- 1:9.2p1-2+deb12u7 · amd64 · bookworm-updates
  Not affected
  usn · openssh · debian · bookworm
- 1:9.2p1-2+deb12u7 · arm64 · bookworm-updates
  Not affected
  usn · openssh · debian · bookworm
[openssh-server-gssapi]Unknown
Source package: [openssh]
Details (2)
- 1:10.0p1-7~bpo12+1 · all · bookworm-backports
  Not affected
  usn · openssh · debian · bookworm
- 1:10.0p1-7~bpo12+1 · all · bookworm-backports
  Not affected
  usn · openssh · debian · bookworm
[openssh-sftp-server]Unknown
Source package: [openssh]
Details (8)
- 1:9.2p1-2+deb12u10 · amd64 · bookworm
  Not affected
  usn · openssh · debian · bookworm
- 1:9.2p1-2+deb12u10 · arm64 · bookworm
  Not affected
  usn · openssh · debian · bookworm
- 1:10.0p1-7~bpo12+1 · amd64 · bookworm-backports
  Not affected
  usn · openssh · debian · bookworm
- 1:10.0p1-7~bpo12+1 · arm64 · bookworm-backports
  Not affected
  usn · openssh · debian · bookworm
- 1:9.2p1-2+deb12u9 · amd64 · bookworm-security
  Not affected
  usn · openssh · debian · bookworm
- 1:9.2p1-2+deb12u9 · arm64 · bookworm-security
  Not affected
  usn · openssh · debian · bookworm
- 1:9.2p1-2+deb12u7 · amd64 · bookworm-updates
  Not affected
  usn · openssh · debian · bookworm
- 1:9.2p1-2+deb12u7 · arm64 · bookworm-updates
  Not affected
  usn · openssh · debian · bookworm
[openssh-tests]Unknown
Source package: [openssh]
Details (8)
- 1:9.2p1-2+deb12u10 · amd64 · bookworm
  Not affected
  usn · openssh · debian · bookworm
- 1:9.2p1-2+deb12u10 · arm64 · bookworm
  Not affected
  usn · openssh · debian · bookworm
- 1:10.0p1-7~bpo12+1 · amd64 · bookworm-backports
  Not affected
  usn · openssh · debian · bookworm
- 1:10.0p1-7~bpo12+1 · arm64 · bookworm-backports
  Not affected
  usn · openssh · debian · bookworm
- 1:9.2p1-2+deb12u9 · amd64 · bookworm-security
  Not affected
  usn · openssh · debian · bookworm
- 1:9.2p1-2+deb12u9 · arm64 · bookworm-security
  Not affected
  usn · openssh · debian · bookworm
- 1:9.2p1-2+deb12u7 · amd64 · bookworm-updates
  Not affected
  usn · openssh · debian · bookworm
- 1:9.2p1-2+deb12u7 · arm64 · bookworm-updates
  Not affected
  usn · openssh · debian · bookworm
[ssh]Unknown
Source package: [openssh]
Details (8)
- 1:9.2p1-2+deb12u10 · all · bookworm
  Not affected
  usn · openssh · debian · bookworm
- 1:9.2p1-2+deb12u10 · all · bookworm
  Not affected
  usn · openssh · debian · bookworm
- 1:10.0p1-7~bpo12+1 · all · bookworm-backports
  Not affected
  usn · openssh · debian · bookworm
- 1:10.0p1-7~bpo12+1 · all · bookworm-backports
  Not affected
  usn · openssh · debian · bookworm
- 1:9.2p1-2+deb12u9 · all · bookworm-security
  Not affected
  usn · openssh · debian · bookworm
- 1:9.2p1-2+deb12u9 · all · bookworm-security
  Not affected
  usn · openssh · debian · bookworm
- 1:9.2p1-2+deb12u7 · all · bookworm-updates
  Not affected
  usn · openssh · debian · bookworm
- 1:9.2p1-2+deb12u7 · all · bookworm-updates
  Not affected
  usn · openssh · debian · bookworm
[ssh-askpass-gnome]Unknown
Source package: [openssh]
Details (8)
- 1:9.2p1-2+deb12u10 · amd64 · bookworm
  Not affected
  usn · openssh · debian · bookworm
- 1:9.2p1-2+deb12u10 · arm64 · bookworm
  Not affected
  usn · openssh · debian · bookworm
- 1:10.0p1-7~bpo12+1 · amd64 · bookworm-backports
  Not affected
  usn · openssh · debian · bookworm
- 1:10.0p1-7~bpo12+1 · arm64 · bookworm-backports
  Not affected
  usn · openssh · debian · bookworm
- 1:9.2p1-2+deb12u9 · amd64 · bookworm-security
  Not affected
  usn · openssh · debian · bookworm
- 1:9.2p1-2+deb12u9 · arm64 · bookworm-security
  Not affected
  usn · openssh · debian · bookworm
- 1:9.2p1-2+deb12u7 · amd64 · bookworm-updates
  Not affected
  usn · openssh · debian · bookworm
- 1:9.2p1-2+deb12u7 · arm64 · bookworm-updates
  Not affected
  usn · openssh · debian · bookworm

[Debian 13 (Trixie)]

[openssh-client]Unknown
Source package: [openssh]
Details (6)
- 1:10.0p1-7+deb13u4 · amd64 · trixie
  Fixed · Fixed: 1:9.8p1-1
  usn · openssh · debian · 13
- 1:10.0p1-7+deb13u4 · arm64 · trixie
  Fixed · Fixed: 1:9.8p1-1
  usn · openssh · debian · 13
- 1:10.3p1-1~bpo13+1 · amd64 · trixie-backports
  Fixed · Fixed: 1:9.8p1-1
  usn · openssh · debian · 13
- 1:10.3p1-1~bpo13+1 · arm64 · trixie-backports
  Fixed · Fixed: 1:9.8p1-1
  usn · openssh · debian · 13
- 1:10.0p1-7+deb13u2 · amd64 · trixie-security
  Fixed · Fixed: 1:9.8p1-1
  usn · openssh · debian · 13
- 1:10.0p1-7+deb13u2 · arm64 · trixie-security
  Fixed · Fixed: 1:9.8p1-1
  usn · openssh · debian · 13
[openssh-client-gssapi]Unknown
Source package: [openssh]
Details (6)
- 1:10.0p1-7+deb13u4 · all · trixie
  Fixed · Fixed: 1:9.8p1-1
  usn · openssh · debian · 13
- 1:10.0p1-7+deb13u4 · all · trixie
  Fixed · Fixed: 1:9.8p1-1
  usn · openssh · debian · 13
- 1:10.3p1-1~bpo13+1 · all · trixie-backports
  Fixed · Fixed: 1:9.8p1-1
  usn · openssh · debian · 13
- 1:10.3p1-1~bpo13+1 · all · trixie-backports
  Fixed · Fixed: 1:9.8p1-1
  usn · openssh · debian · 13
- 1:10.0p1-7+deb13u2 · all · trixie-security
  Fixed · Fixed: 1:9.8p1-1
  usn · openssh · debian · 13
- 1:10.0p1-7+deb13u2 · all · trixie-security
  Fixed · Fixed: 1:9.8p1-1
  usn · openssh · debian · 13
[openssh-server]Unknown
Source package: [openssh]
Details (6)
- 1:10.0p1-7+deb13u4 · amd64 · trixie
  Fixed · Fixed: 1:9.8p1-1
  usn · openssh · debian · 13
- 1:10.0p1-7+deb13u4 · arm64 · trixie
  Fixed · Fixed: 1:9.8p1-1
  usn · openssh · debian · 13
- 1:10.3p1-1~bpo13+1 · amd64 · trixie-backports
  Fixed · Fixed: 1:9.8p1-1
  usn · openssh · debian · 13
- 1:10.3p1-1~bpo13+1 · arm64 · trixie-backports
  Fixed · Fixed: 1:9.8p1-1
  usn · openssh · debian · 13
- 1:10.0p1-7+deb13u2 · amd64 · trixie-security
  Fixed · Fixed: 1:9.8p1-1
  usn · openssh · debian · 13
- 1:10.0p1-7+deb13u2 · arm64 · trixie-security
  Fixed · Fixed: 1:9.8p1-1
  usn · openssh · debian · 13
[openssh-server-gssapi]Unknown
Source package: [openssh]
Details (6)
- 1:10.0p1-7+deb13u4 · all · trixie
  Fixed · Fixed: 1:9.8p1-1
  usn · openssh · debian · 13
- 1:10.0p1-7+deb13u4 · all · trixie
  Fixed · Fixed: 1:9.8p1-1
  usn · openssh · debian · 13
- 1:10.3p1-1~bpo13+1 · all · trixie-backports
  Fixed · Fixed: 1:9.8p1-1
  usn · openssh · debian · 13
- 1:10.3p1-1~bpo13+1 · all · trixie-backports
  Fixed · Fixed: 1:9.8p1-1
  usn · openssh · debian · 13
- 1:10.0p1-7+deb13u2 · all · trixie-security
  Fixed · Fixed: 1:9.8p1-1
  usn · openssh · debian · 13
- 1:10.0p1-7+deb13u2 · all · trixie-security
  Fixed · Fixed: 1:9.8p1-1
  usn · openssh · debian · 13
[openssh-sftp-server]Unknown
Source package: [openssh]
Details (6)
- 1:10.0p1-7+deb13u4 · amd64 · trixie
  Fixed · Fixed: 1:9.8p1-1
  usn · openssh · debian · 13
- 1:10.0p1-7+deb13u4 · arm64 · trixie
  Fixed · Fixed: 1:9.8p1-1
  usn · openssh · debian · 13
- 1:10.3p1-1~bpo13+1 · amd64 · trixie-backports
  Fixed · Fixed: 1:9.8p1-1
  usn · openssh · debian · 13
- 1:10.3p1-1~bpo13+1 · arm64 · trixie-backports
  Fixed · Fixed: 1:9.8p1-1
  usn · openssh · debian · 13
- 1:10.0p1-7+deb13u2 · amd64 · trixie-security
  Fixed · Fixed: 1:9.8p1-1
  usn · openssh · debian · 13
- 1:10.0p1-7+deb13u2 · arm64 · trixie-security
  Fixed · Fixed: 1:9.8p1-1
  usn · openssh · debian · 13
[openssh-tests]Unknown
Source package: [openssh]
Details (6)
- 1:10.0p1-7+deb13u4 · amd64 · trixie
  Fixed · Fixed: 1:9.8p1-1
  usn · openssh · debian · 13
- 1:10.0p1-7+deb13u4 · arm64 · trixie
  Fixed · Fixed: 1:9.8p1-1
  usn · openssh · debian · 13
- 1:10.3p1-1~bpo13+1 · amd64 · trixie-backports
  Fixed · Fixed: 1:9.8p1-1
  usn · openssh · debian · 13
- 1:10.3p1-1~bpo13+1 · arm64 · trixie-backports
  Fixed · Fixed: 1:9.8p1-1
  usn · openssh · debian · 13
- 1:10.0p1-7+deb13u2 · amd64 · trixie-security
  Fixed · Fixed: 1:9.8p1-1
  usn · openssh · debian · 13
- 1:10.0p1-7+deb13u2 · arm64 · trixie-security
  Fixed · Fixed: 1:9.8p1-1
  usn · openssh · debian · 13
[ssh]Unknown
Source package: [openssh]
Details (6)
- 1:10.0p1-7+deb13u4 · all · trixie
  Fixed · Fixed: 1:9.8p1-1
  usn · openssh · debian · 13
- 1:10.0p1-7+deb13u4 · all · trixie
  Fixed · Fixed: 1:9.8p1-1
  usn · openssh · debian · 13
- 1:10.3p1-1~bpo13+1 · all · trixie-backports
  Fixed · Fixed: 1:9.8p1-1
  usn · openssh · debian · 13
- 1:10.3p1-1~bpo13+1 · all · trixie-backports
  Fixed · Fixed: 1:9.8p1-1
  usn · openssh · debian · 13
- 1:10.0p1-7+deb13u2 · all · trixie-security
  Fixed · Fixed: 1:9.8p1-1
  usn · openssh · debian · 13
- 1:10.0p1-7+deb13u2 · all · trixie-security
  Fixed · Fixed: 1:9.8p1-1
  usn · openssh · debian · 13
[ssh-askpass-gnome]Unknown
Source package: [openssh]
Details (6)
- 1:10.0p1-7+deb13u4 · amd64 · trixie
  Fixed · Fixed: 1:9.8p1-1
  usn · openssh · debian · 13
- 1:10.0p1-7+deb13u4 · arm64 · trixie
  Fixed · Fixed: 1:9.8p1-1
  usn · openssh · debian · 13
- 1:10.3p1-1~bpo13+1 · amd64 · trixie-backports
  Fixed · Fixed: 1:9.8p1-1
  usn · openssh · debian · 13
- 1:10.3p1-1~bpo13+1 · arm64 · trixie-backports
  Fixed · Fixed: 1:9.8p1-1
  usn · openssh · debian · 13
- 1:10.0p1-7+deb13u2 · amd64 · trixie-security
  Fixed · Fixed: 1:9.8p1-1
  usn · openssh · debian · 13
- 1:10.0p1-7+deb13u2 · arm64 · trixie-security
  Fixed · Fixed: 1:9.8p1-1
  usn · openssh · debian · 13

Observed: Oct 27, 2026, 3:15:31 AM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX] · [Ubuntu Security Notices (USN)]