Buffer overflow in D-Link Dir-822a
CVE-2026-86510
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (42.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 43rd percentile — 42.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: +0.000
Affected products
- D-Link Dir-822a — versions A_101
Weakness classification (CWE)
References
- vuldb.com/vuln/399663 (technical-description, vdb-entry)
- vuldb.com/vuln/399663/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-86510 (third-party-advisory)
- vuldb.com/submit/906300 (third-party-advisory)
- tzh00203.notion.site/D-Link-DIR-822A-L2TP-Host-Name-AVP-Out-of-Bounds-Write-33c… (exploit)
- www.dlink.com/ (product)
Frequently asked questions
- What is CVE-2026-86510?
- CVE-2026-86510 is a critical-severity vulnerability in D-Link Dir-822a, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.9/10. Published 2026-09-08.
- How severe is CVE-2026-86510?
- Critical severity. CVSS v3 base score is 9.9 out of 10.