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Fencer Vulns
critical 9.3

CVE-2026-0625 json

D-Link DSL/DIR/DNS Authentication Bypass via DNS Configuration Endpoint

published 2026-01-05 10 mo ago modified 2026-10-26 13 d ago also EUVD-2026-0944

cvss
9.3
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.0%
EPSS 1.0% chance of exploitation in 30 days, percentile 62%
public exploits
0
none known

Summary

Multiple D-Link DSL/DIR/DNS devices contain an authentication bypass and improper access control vulnerability in the dnscfg.cgi endpoint that allows an unauthenticated attacker to access DNS configuration functionality. By directly requesting this endpoint, an attacker can modify the device’s DNS settings without valid credentials, enabling DNS hijacking (“DNSChanger”) attacks that redirect user traffic to attacker-controlled infrastructure. In 2019, D-Link reported that this behavior was leveraged by the "GhostDNS" malware ecosystem targeting consumer and carrier routers. All impacted products were subsequently designated end-of-life/end-of-service, and no longer receive security updates. Exploitation evidence was observed by the Shadowserver Foundation on 2025-11-27 (UTC).

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
9 mo ago

Exploit prediction

0.97% chance of exploitation in the next 30 days, higher than 62% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 9.3 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CNA 4.0 9.3 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

  • D-Link DSL-2640B
  • D-Link DSL-2740R
  • D-Link DSL-2780B
  • D-Link DSL-526B
  • D-Link DSL-2640T
  • D-Link DSL-500
  • D-Link DSL-500G
  • D-Link DSL-502G
  • D-Link DIR-905L
  • D-Link DIR-600
  • D-Link DIR-608
  • D-Link DIR-610
  • D-Link DIR-611
  • D-Link DIR-615
  • D-Link DNS-320
  • D-Link DNS-325
  • D-Link DNS-345

Classification

Weakness
  • CWE-306 Missing Authentication for Critical Functionality

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.