An authentication bypass vulnerability in the Universal Plug and Play (UPnP) framework of the Sercomm AOT-4221SR 4.6 Dual Band GPON ONU…
Affects Sercomm AOT-4221SR Dual Band GPON ONU firmware AOT4221SR_R4.6, where the UPnP service listens on port 5555 by default. The checked facts list no vendor rating and no fix.
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: The checked facts contain no workaround or fix. The exposure they describe is the unauthenticated UPnP service on port 5555, reachable from the local network, so that is the part to watch until the vendor publishes guidance.
- 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- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean?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? →
- 5/100 · 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 UPnP framework on the Sercomm AOT-4221SR GPON ONU router is affected by an authentication bypass that lets unauthenticated attackers send arbitrary commands to exposed administrative, WAN, LAN, and firewall services. This could allow an attacker to change routing and DNS settings, remove firewall rules, and fully take over the device and the network it protects.
Read the original description
An authentication bypass vulnerability in the Universal Plug and Play (UPnP) framework of the Sercomm AOT-4221SR 4.6 Dual Band GPON ONU device allows an attackers to execute arbitrary SOAP requests via port 5555. This flaw exposes 15 administrative, WAN, LAN, and firewall services without requiring credentials, enabling attackers to modify core routing tables, alter DNS servers, remove firewall rules, and completely compromise the network.
What to do
Workaround: The checked facts contain no workaround or fix. The exposure they describe is the unauthenticated UPnP service on port 5555, reachable from the local network, so that is the part to watch until the vendor publishes guidance.
Timeline
- CVE published
- Record last updated
- First seen by cve.now
Evidence 2
- Repository
- Link
Corrections
None so far.
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Questions about CVE-2026-117082
What does this mean?
The UPnP service accepts SOAP requests over HTTP without authentication, so any device on the local network can send them. The advisory describes complete loss of confidentiality, integrity and availability, including compromise of the LAN and WAN.Source: github.com
Am I affected, and how do I check?
Firmware AOT4221SR_R4.6 on the Sercomm AOT-4221SR Dual Band GPON ONU, where the UPnP service listens on port 5555 in its default configuration. Compare the device's firmware version with AOT4221SR_R4.6 and check whether the UPnP service is running.Source: github.com
What should I do about it?
The checked facts do not name a fixed firmware version, so no upgrade target is given. Check the vendor's advisory for an updated firmware release.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?
The checked facts contain no workaround or fix. The exposure they describe is the unauthenticated UPnP service on port 5555, reachable from the local network, so that is the part to watch until the vendor publishes guidance.Source: github.com