Heap-based Buffer Overflow Affecting network-manager-l2tp package, versions <1.20.20-2+deb13u1


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.26% (18th percentile)

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  • Snyk IDSNYK-ECHOLATEST-NETWORKMANAGERL2TP-19823649
  • published15 Sept 2026
  • disclosed18 Sept 2026

Introduced: 15 Sep 2026

NewCVE-2026-75883  (opens in a new tab)
CWE-122  (opens in a new tab)

How to fix?

Upgrade Echo:latest network-manager-l2tp to version 1.20.20-2+deb13u1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream network-manager-l2tp package and not the network-manager-l2tp package as distributed by Echo. See How to fix? for Echo:latest relevant fixed versions and status.

The code in pppd that formats a response to a PEAP Request packet in peap_response() copies an entire TLS record of up to 16384 bytes into the fixed global buffer outpacket_buf without checking the available space and without implementing outgoing PEAP fragmentation. Thus a pppd process connecting to a server which requests PEAP authentication can be induced to corrupt global static data following the outpacket_buf array, most likely causing incorrect behavior or a crash.

CVSS Base Scores

version 3.1