CVE-2026-5211

D-Link DNS-1550-04 app_mgr.cgi UPnP_AV_Server_Path_Del stack-based overflow

HIGH
8.8
CVSS Score
Published: March 31, 2026 at 07:30 PM UTC
Updated: July 24, 2026 at 08:20 PM UTC
41 products affected across 1 vendorDNS 340L FirmwareDNS 327L FirmwareDNS 345 Firmware

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Severity
HIGH8.8
Exploit prediction
EPSS 0.7%
SSVC
PoC

Description

A flaw has been found in D-Link DNS-120, DNR-202L, DNS-315L, DNS-320, DNS-320L, DNS-320LW, DNS-321, DNR-322L, DNS-323, DNS-325, DNS-326, DNS-327L, DNR-326, DNS-340L, DNS-343, DNS-345, DNS-726-4, DNS-1100-4, DNS-1200-05 and DNS-1550-04 up to 20260205. This vulnerability affects the function UPnP_AV_Server_Path_Del of the file /cgi-bin/app_mgr.cgi. Executing a manipulation of the argument f_dir can lead to stack-based buffer overflow. The attack can be executed remotely. The exploit has been published and may be used.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v ≤ 2026-02-0520260205
dlink-dnr-202l (same device)
v ≤ 2026-02-0520260205
dlink-dnr-326 (same device)
v ≤ 2026-02-0520260205
dlink-dns-1100-4 (same device)
v ≤ 2026-02-0520260205
dlink-dns-120 (same device)
v ≤ 2026-02-0520260205
dlink-dns-1200-05 (same device)
v ≤ 2026-02-0520260205
dlink-dns-1550-04 (same device)
v ≤ 2026-02-0520260205
dlink-dns-315l (same device)
v ≤ 2026-02-05
v ≤ 2026-02-0520260205
dlink-dns-320l (same device)
v ≤ 2026-02-0520260205
dlink-dns-320lw (same device)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (5)

VDB EntryTechnical DescriptionThird Party Advisory
Source: cverecord
https://vuldb.com/vuln/354347
SignaturePermissions RequiredVDB Entry
Source: cverecord
https://vuldb.com/vuln/354347/cti
Third Party AdvisoryVDB Entry
Source: cverecord
https://vuldb.com/submit/780434
Product
Source: cverecord
https://www.dlink.com/

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGHVulDB
Vector?

Quick Info

StatusANALYZED
CWE
CWE-121CWE-119CWE-787

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