---
id: "CVE-2020-29557"
kind: "vulnerability"
aliases: ["CVE-2020-29557"]
title: "D-Link DIR-825 R1 Devices: D-Link DIR-825 R1 Devices Buffer Overflow Vulnerability"
severity: "critical"
cvss: 10.0
epss: 0.5432
exploited: true
status: "open"
category: "infrastructure"
products: [{"name": "D-Link DIR-825 R1 Devices", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["d-link", "dir-825", "exploited", "infrastructure", "routers", "self-hosted"]
not_affected_if: ["other-hardware"]
published_at: "2021-01-29T20:15:12+00:00"
first_seen_at: "2026-10-23T19:11:53+00:00"
updated_at: "2026-10-23T21:57:35+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2020-29557", "first_seen_at": "2026-10-23T19:11:53+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2020-29557", "first_seen_at": "2026-10-23T19:13:44+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-29557", "first_seen_at": "2026-10-23T21:57:35+00:00"}]
---

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

D-Link DIR-825 R1 routers have a buffer overflow in the web interface. A remote attacker may be able to run code on the device.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:D-Link DIR-825 R1 Devices affected ? fixed ?

## Fix

Apply updates per vendor instructions (D-Link). Specific fixed firmware version: unknown

## Timeline

- 2026-10-23T19:11:53+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2020-29557
- 2026-10-23T19:13:44+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2020-29557
- 2026-10-23T21:57:35+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2020-29557

## From the sources

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.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_