# CVE-2026-0625: D-Link DSL/DIR/DNS Authentication Bypass via DNS Configuration Endpoint

> Unauthenticated attackers can bypass authentication to modify DNS settings on D-Link routers, enabling DNS hijacking attacks.

- **Severity:** Critical 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`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 5 Jan 2026
- **Updated:** 25 May 2026
- **Also known as:** GHSA-v9p2-66r4-9qhr

## What is CVE-2026-0625?

CVE-2026-0625 is a critical authentication bypass vulnerability in D-Link DIR-600, published on 5 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

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).

Weakness: CWE-306 (Missing Authentication for Critical Functionality)

## Which versions are affected by CVE-2026-0625?


## How do I fix CVE-2026-0625?

No fix has been published for CVE-2026-0625 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-0625 being exploited?

There is no known exploitation of CVE-2026-0625 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-0625 and fix it if it is affected.

What it is: CVE-2026-0625 is a critical authentication bypass vulnerability in D-Link DIR-600, published on 5 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-0625 in the wild and no public exploit code.

Affected product: D-Link DIR-600. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-0625/ (Markdown: https://insights.sbomify.com/CVE-2026-0625/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-0625
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-0625
- OSV: https://osv.dev/vulnerability/CVE-2026-0625

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-0625/
Summaries are generated and may contain mistakes; the official description above is the record.