An issue in WCH CH340/CH341 USB-to-Serial Windows Driver setup package CH341SER.EXE version 4.0 allows a local attacker to escalate…
Only CH341SER.EXE version 4.0 was confirmed affected in testing; other versions were not verified. The vendor rating is not listed, and no fix is listed.
- Published
- 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- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean?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
- 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? →
- Specific setups only
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- 1 proof of concept on GitHub
- Exploitation: poc
- Automatable: no
- Technical impact: total
Summary
The WCH CH340/CH341 USB-to-Serial Windows driver setup package (CH341SER.EXE) is affected. A local attacker who already has access to the system could exploit this flaw to gain higher privileges than they are authorized to have.
Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.
Read the original description
An issue in WCH CH340/CH341 USB-to-Serial Windows Driver setup package CH341SER.EXE version 4.0 allows a local attacker to escalate privileges.
Timeline
- CVE published
- First seen by cve.now
- CISA SSVC assessment
Exploitation: poc · Automatable: no · Technical impact: total
- Record last updated
Affected versions
No affected packages have been listed by the sources.
References 2
wch-ic.com
GitHub · tanuj8124/CVE-2026-106781
Questions about CVE-2026-106781
What does this mean?
Staging directories used by the installer grant modification access to Authenticated Users, so attacker-controlled code can run with the privileges of the elevated installer. This is local privilege escalation, and it requires running the installation workflow.Source: github.com
Am I affected, and how do I check?
Confirmed in testing on CH341SER.EXE version 4.0; other versions were not verified. A reader can check which version of the CH341SER.EXE setup package they have, and whether the installation workflow uses the affected staging directories.Source: github.com
What should I do about it?
The checked facts do not list a fixed version or an upgrade target, so no specific upgrade can be named.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. CISA's SSVC assessment notes a proof of concept exists. Public exploit code exists (a proof of concept on GitHub).Source: cve.now feed data
What if there's no patch?
The checked facts give no workaround. The condition is that installer staging directories grant modification access to Authenticated Users, but the facts do not say whether changing that access is safe or supported.Source: github.com