CVE-2026-86510: D-Link DIR-822A L2TP Control Message tunnel_set_params out-of-bounds write

Severity: critical (CVSS 9.9 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-08 · updated 2026-09-08
Weakness: CWE-119

Description

A vulnerability has been found in D-Link DIR-822A A_101. Affected is the function tunnel_set_params of the component L2TP Control Message Parser. Such manipulation leads to out-of-bounds write. The attack can be launched remotely. The exploit has been disclosed to the public and may be used.

Affected products

D-Link DIR-822A: A_101

References

https://tzh00203.notion.site/D-Link-DIR-822A-L2TP-Host-Name-AVP-Out-of-Bounds-Write-33cb5c52018a80a7af5fdc1af3d5aa73
https://vuldb.com/cve/CVE-2026-86510
https://vuldb.com/submit/906300
https://vuldb.com/vuln/399663
https://vuldb.com/vuln/399663/cti
https://www.dlink.com/

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