Integer overflow in PPP - #VU151452
Published: September 19, 2026
Vulnerability identifier: #VU151452
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-190
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to an integer underflow during EAP-PEAP Start packet handling in pppd when processing a second EAP-PEAP Start packet with a different identifier. A remote attacker can send a crafted second EAP-PEAP Start packet to cause a denial of service.
The local pppd instance must be configured to authenticate itself using PEAP and have a CA certificate configured.
Affected software
PPP
Remediation
Install security update from vendor's website.
PPP - update to 2.5.4