CVE-2020-29557

CRITICAL9.8

CISA KEV

Published 2021-01-29 · Updated 2026-06-17 · Source cve@mitre.org

Summary

CVE-2020-29557 is a critical-severity (CVSS 9.8) vulnerability in D-Link DIR-825 R1 Devices. CISA added it to the Known Exploited Vulnerabilities catalog on November 3, 2021, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by May 3, 2022. CISA does not currently list it as used in ransomware campaigns. D-Link has 26 vulnerabilities in the KEV catalog, 2 of them linked to ransomware.

All 26 known-exploited D-Link vulnerabilities →

Description

An issue was discovered on D-Link DIR-825 R1 devices through 3.0.1 before 2020-11-20. A buffer overflow in the web interface allows attackers to achieve pre-authentication remote code execution.

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE-119CWE-119

CISA Known-Exploited Vulnerability

Product: D-Link — DIR-825 R1 Devices

Name: D-Link DIR-825 R1 Devices Buffer Overflow Vulnerability

Date added: 2021-11-03 · Due: 2022-05-03

Required action: Apply updates per vendor instructions.

References

View on NVD

More exploited D-Link vulnerabilities

Most recently added to CISA KEV

CVE-2025-29635
DIR-823X — D-Link DIR-823X Command Injection Vulnerability
added 2026-04-24
CVE-2022-37055
Routers — D-Link Routers Buffer Overflow Vulnerability
added 2025-12-08
CVE-2020-25078
DCS-2530L and DCS-2670L Devices — D-Link DCS-2530L and DCS-2670L Devices Unspecified Vulnerability
added 2025-08-05
CVE-2020-25079
DCS-2530L and DCS-2670L Devices — D-Link DCS-2530L and DCS-2670L Command Injection Vulnerability
added 2025-08-05
CVE-2022-40799
DNR-322L — D-Link DNR-322L Download of Code Without Integrity Check Vulnerability
added 2025-08-05
CVE-2024-0769
DIR-859 Router — D-Link DIR-859 Router Path Traversal Vulnerability
added 2025-06-25

View all →

Related CVEs

Same severity, most recent

CVE-2026-124060
A vulnerability was detected in TOTOLINK CA300-PoE 6.2c.884. Affected by this issue is the function UploadCustomModule of the file /cgi-bin/cstecgi.cgi. The manipulation of the argument File results in buffer overflow. The attack may be launched remotely. The exploit is now public and may be used.
2026-11-07 · score 9.1
CVE-2026-124059
A security vulnerability has been detected in TOTOLINK CA300-PoE 6.2c.884. Affected by this vulnerability is the function setWiFiWdsAddConfig of the file /cgi-bin/cstecgi.cgi. The manipulation of the argument ApCliKeyStr leads to buffer overflow. The attack may be initiated remotely. The exploit has been disclosed publicly and may be used.
2026-11-07 · score 9.1
CVE-2026-124058
A weakness has been identified in TOTOLINK CA300-PoE 6.2c.884. Affected is the function setWiFiRepeaterConfig of the file /cgi-bin/cstecgi.cgi. Executing a manipulation of the argument ApCliKeyStr can lead to buffer overflow. The attack can be launched remotely. The exploit has been made available to the public and could be used for attacks.
2026-11-07 · score 9.1
CVE-2026-124057
A security flaw has been discovered in TOTOLINK CA300-PoE 6.2c.884. This impacts the function setWiFiMultipleConfig of the file /cgi-bin/cstecgi.cgi. Performing a manipulation of the argument Key1Str1 results in buffer overflow. The attack can be initiated remotely. The exploit has been released to the public and may be used for attacks.
2026-11-07 · score 9.1
CVE-2026-123966
A vulnerability was determined in Tenda AC19 16.03.10.07. Affected by this issue is the function saveParentControlInfo of the file /goform/saveParentControlInfo. This manipulation of the argument deviceId causes heap-based buffer overflow. The attack is possible to be carried out remotely. The exploit has been publicly disclosed and may be utilized.
2026-11-07 · score 10.0