Threats / D-Link / CVE-2020-29557
CVE-2020-29557
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-06-22
D-Link DIR-825 R1 Devices vulnerability
D-Link DIR-825 R1 devices contain a buffer overflow vulnerability in the web interface that may allow remote code execution.
Verdict
Today item — known-exploited.
A buffer overflow in the web interface of D-Link DIR-825 R1 devices enables unauthenticated remote code execution. The vulnerability is actively exploited in the wild with high exploit probability.
01
Is it exploitable?
— the evidence, ranked above the scoreReported exploitation
37 independent public reports of in-the-wild exploitation are cataloged.Distinct reporting sources (vendor, incident response, government); open them for the underlying claims.
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03).
Probability (EPSS)
EPSS 0.5432 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
Affected: D-Link, DIR-825 R1 Devices. Confirm exact fixed builds in the vendor advisory.
Weakness (CWE)
Mapped to CWE-119 Memory Buffer Bounds Error — weakness family: Memory safety.CWE assignment from the public NVD record; the weakness class drives how the flaw is exploited.
02
Who’s exploiting it?
— attribution turns risk into urgencyAttribution not established
No confirmed (advisory-backed) threat-actor attribution is established for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.
03
Why it matters
— the attack path, told twice: adversary, then board1
Front door — unauthenticated access narrative 1
Attacker
I craft a malicious HTTP request to the web interface that exceeds buffer boundaries.
Business
The device becomes a compromised network access point under attacker control.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I inject shellcode through the overflow to execute arbitrary commands on the device.
Business
Attackers gain persistent presence on the network perimeter with administrative privileges.
3
Lateral reach — past segmentation narrative 3
Attacker
I use the compromised router to intercept, modify, or redirect network traffic.
Business
Customer data and credentials transmitted across the network are exposed to interception and theft.
4
Data at risk — exfiltration narrative 4
Attacker
I establish the device as a pivot point to attack internal network resources.
Business
Internal systems and sensitive assets become accessible to lateral movement attacks.
04
What to do
— defensible action- Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
05