DEBIAN-CVE-2026-121506
Dashboard / Vulnerabilities / DEBIAN-CVE-2026-121506
Summary:
Details: An out-of-bounds read and write in NTS client extension field parsing (extens_client_recv) in NTPsec before 1.2.5 allows a remote attacker who can send NTP server-mode replies to an NTS client to corrupt heap memory and crash ntpd, and, combined with the NTS-KE client out-of-bounds read fixed in 1.2.4, to bypass NTS authentication and set the client's time, via an NTS Authenticator and Encrypted Extension Fields field whose nonce length exceeds the field.
Affected packages
Package
Name: ntpsec
Purl: pkg:deb/debian/ntpsec?arch=source&distro=bookworm
Affected ranges
Type: ECOSYSTEM
Events:
Introduced- 0
Fixed -None
Affected versions
1.2.2+dfsg1-1
1.2.2+dfsg1-1+deb12u1
1.2.2+dfsg1-2
1.2.2+dfsg1-3
1.2.2+dfsg1-4
1.2.3+dfsg1-1
1.2.3+dfsg1-2
1.2.3+dfsg1-3
1.2.3+dfsg1-4
1.2.3+dfsg1-5
1.2.3+dfsg1-6
1.2.3+dfsg1-7
1.2.3+dfsg1-8
1.2.4+dfsg-1
1.2.5+dfsg-1
Common Vulnerability Scoring System
Attack Vector
Network
Adjacent
Local
Physical
Privileges Required
None
Low
High
User Interaction
None
Required
Scope
Unchanged
Changed
Confidentiality
None
Low
High
Integrity
None
Low
High
Availability
None
Low
High
