WAVLINK WN551X3-A DNS Resolution ioos sub_41a430 os command injection
Affects WAVLINK WN551X3-A on firmware M51X3_V251020-WO-182e965. No fixed version is listed in the checked facts.
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
- Exploited
- No known exploitation
- Fix
- No fix listed
- Who is exposed
- Not reported
Do first: Workaround: While no fix is listed, limit access to port 81 on the ioos service and restrict who holds valid session tokens. The checked facts give no other workaround.
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- Published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- A 0-100 score for how much a CVE matters across the industry: exploitation, exposure, how widely the software is used, severity and whether a fix exists.What do these mean? →
- 22/100 · provisional
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Unclear
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
The WAVLINK WN551X3-A router firmware contains a flaw in its DNS resolution handler that lets a remote attacker inject operating system commands through a crafted input argument. Successful exploitation could allow an attacker to run arbitrary commands on the affected device.
Read the original description
A vulnerability was found in WAVLINK WN551X3-A M51X3_V251020-WO-182e965. This impacts the function sub_41a430 of the file /bin/ioos of the component DNS Resolution Handler. Performing a manipulation of the argument data results in os command injection. It is possible to initiate the attack remotely. The exploit has been made public and could be used. The vendor was contacted early about this disclosure.
What to do
Workaround: While no fix is listed, limit access to port 81 on the ioos service and restrict who holds valid session tokens. The checked facts give no other workaround.
Timeline
- CVE published
- First seen by cve.now
- Posted on X by cve.now
Affected versions
- WAVLINK WN551X3-A
M51X3_V251020-WO-182e965
Evidence 5
- Advisory
- Advisory
- Advisory
- Advisory
- Exploit
Corrections
None so far.
Something wrong on this page? Report an error. Every fix is listed here.
Questions about CVE-2026-120345
What does this mean?
The ioos service on port 81 passes injected shell commands to the operating system, which can give an attacker full root control of the device.Source: github.com
Am I affected, and how do I check?
The listed product is WAVLINK WN551X3-A running firmware M51X3_V251020-WO-182e965. To check a device, compare its reported firmware version with that string. Reaching the ioos service requires loopback or SSRF access to port 81, or holding a valid session token.Source: github.com
What should I do about it?
The checked facts name no fixed firmware version, so no upgrade target can be given from them. Check the vendor's site for an updated firmware for this model.Source: github.com
Is it being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.Source: cve.now feed data
What if there's no patch?
While no fix is listed, limit access to port 81 on the ioos service and restrict who holds valid session tokens. The checked facts give no other workaround.Source: github.com