PT-2026-25591 · D Link · Dns-340L+18

Pjqwudi · CVE-2026-4211 · Published 2026-03-03 · Updated 2026-03-16

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions D-Link DNS-120 D-Link DNR-202L D-Link DNS-315L D-Link DNS-320 D-Link DNS-320L D-Link DNS-320LW D-Link DNS-321 D-Link DNR-322L D-Link DNS-323 D-Link DNS-325 D-Link DNS-326 D-Link DNS-327L D-Link DNR-326 D-Link DNS-340L D-Link DNS-343 D-Link DNS-345 D-Link DNS-726-4 D-Link DNS-1100-4 D-Link DNS-1200-05 D-Link DNS-1550-04 versions prior to 20260205

Description A weakness exists in multiple D-Link devices. The Local Backup Info function within the /cgi-bin/local backup mgr.cgi file is susceptible to a stack-based buffer overflow. Manipulation of the f idx argument triggers this issue, and the attack can be initiated remotely. An exploit for this issue has been publicly released.

Recommendations D-Link DNS-120 versions prior to 20260205 D-Link DNR-202L versions prior to 20260205 D-Link DNS-315L versions prior to 20260205 D-Link DNS-320 versions prior to 20260205 D-Link DNS-320L versions prior to 20260205 D-Link DNS-320LW versions prior to 20260205 D-Link DNS-321 versions prior to 20260205 D-Link DNR-322L versions prior to 20260205 D-Link DNS-323 versions prior to 20260205 D-Link DNS-325 versions prior to 20260205 D-Link DNS-326 versions prior to 20260205 D-Link DNS-327L versions prior to 20260205 D-Link DNR-326 versions prior to 20260205 D-Link DNS-340L versions prior to 20260205 D-Link DNS-343 versions prior to 20260205 D-Link DNS-345 versions prior to 20260205 D-Link DNS-726-4 versions prior to 20260205 D-Link DNS-1100-4 versions prior to 20260205 D-Link DNS-1200-05 versions prior to 20260205 D-Link DNS-1550-04 versions prior to 20260205

Exploit

Fix

Stack Overflow

Memory Corruption

Buffer Overflow

Weakness Enumeration

CWE-121

CWE-787

CWE-119

Related Identifiers

BDU:2026-09502

CVE-2026-4211

Affected Products

Dnr-202L

Dnr-322L

Dnr-326

Dns-1100-4

Dns-120

Dns-1200-05

Dns-1550-04

Dns-315L

Dns-320

Dns-320L

Dns-321

Dns-323

Dns-325

Dns-326

Dns-327L

Dns-340L

Dns-343

Dns-345

Dns-726-4

References · 10

• 🔥❌ https://github.com/wudipjq/my_vuln/blob/main/D-Link8/vuln_160/160.md · Exploit, Deleted
• https://nvd.nist.gov/vuln/detail/CVE-2026-4211 · Security Note
• https://bdu.fstec.ru/vul/2026-09502 · Security Note
• https://twitter.com/ptdbugs/status/2033448265518100821 · Twitter Post
• https://vuldb.com/?id.351122 · Note
• https://vuldb.com/?submit.770441 · Note
• https://dlink.com · Note
• https://twitter.com/cyberbivash/status/2033421210013299005 · Twitter Post
• https://twitter.com/CveFindCom/status/2033585011006263302 · Twitter Post
• https://vuldb.com/?ctiid.351122 · Note