# CVE-2020-29557: D-Link DIR-825 R1 Devices Buffer Overflow Vulnerability

Source: https://junglewise.ai/threats/cve-2020-29557-d-link-dir-825-r1-devices-buffer-overflow-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2021-11-03. Updated: 2026-05-10  
License: CC BY 4.0 with a link back

CVE-2020-29557 · Severity: critical · CVSS 9.8 · Exploited in the wild · Published 2021-11-03

D-Link DIR-825 R1 devices contain a buffer overflow vulnerability in the web interface. This flaw allows a remote, unauthenticated attacker to achieve code execution on the device.

Vendors: [D-Link](https://junglewise.ai/threats/vendors/d-link).

## Quick answers

**Is CVE-2020-29557 exploited in the wild?** Yes. CVE-2020-29557 is known to be exploited in the wild, first recorded on 3 November 2021. Treat it as urgent.

**How severe is CVE-2020-29557?** Critical severity, with a CVSS score of 9.8, published 3 November 2021.

**Which products and versions are affected?** D-Link DIR-825 R1 Firmware through 3.0.1 before 2020-11-20; D-Link DIR-825 R1; D-Link DIR-825/A D1A; D-Link DIR-825/AC E1A; and 3 more.

**Is there a fix for CVE-2020-29557?** A patch was published on 2020-11-20: Firmware versions before this date are vulnerable. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2020-29557 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2020-29557?** Check whether you run D-Link Dir-825 R1 Devices. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- D-Link DIR-825 R1 Firmware through 3.0.1 before 2020-11-20
- D-Link DIR-825 R1
- D-Link DIR-825/A D1A
- D-Link DIR-825/AC E1A
- D-Link DIR-825/AC E
- D-Link DIR-825/ACF F1
- D-Link DIR-825/GF GF

## Timeline

- 2020-11-20: patched: Firmware versions before this date are vulnerable.
- 2021-11-03: disclosed
- 2021-11-03: kev added: Added to CISA Known Exploited Vulnerabilities Catalog.
- 2021-11-03: exploited: Reported as exploited in the wild.