Command Injection in Digital I/O
Affects Welotec TK100/TK102 before 3.5.116, TK500-v2 before 1.0.124, and TK500-v3 before 1.0.123 when the Digital I/O function is in use. Fixed in the listed versions.
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
- Exploited
- No known exploitation
- Fix
- Fixed in 3.5.116, 1.0.124, 1.0.123
- Who is exposed
- Specific setups only
Do first: Check whether your setup matches what the bug needs. Digital I/O function is in use on an affected Welotec TK-series router Affected Welotec router firmware (TK100/TK102 before 3.5.116, TK500-v2 before 1.0.124, TK500-v3 before 1.0.123)
- Exploitation?/40Exploitation: unknown (data gap). No CISA SSVC exploitation rating yet
- Exposure8/25Specific setups only, reachable over the network
- Reach?/20Reach: unknown (data gap). No tracked technology or package matched
- Severity8.6/10CVSS 8.6
- No patch0/5No signal
What would change the score
- Would score about 67 if added to CISA KEV
- Would score about 62 if CISA's SSVC rates exploitation active
- Would score about 24 if CISA's SSVC rates it automatable
CVE-2026-105981 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 8.6 (high) and affects TK100, TK500-v2 and TK500-v3; fixed in 3.5.116, 1.0.124 and 1.0.123.
- 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- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean?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
- FIRST's estimate of the chance attackers exploit it in the next 30 days, updated daily.What do these mean? →
- 0.36% · 29th percentile
- 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? →
- 17/100 · 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? →
- Specific setups only
- Fix
- Fixed in 3.5.116, 1.0.124, 1.0.123
- 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 Digital I/O function in affected software does not properly validate input, allowing a remote attacker with high privileges to inject operating system commands. Successful exploitation could let the attacker run those commands with root privileges, giving them full control over the system.
Read the original description
Improper input validation in the Digital I/O function may allow a remote attacker with high privileges to inject operating system commands and execute them with root privileges.
What to do
Check whether your setup matches what the bug needs.
Digital I/O function is in use on an affected Welotec TK-series router Affected Welotec router firmware (TK100/TK102 before 3.5.116, TK500-v2 before 1.0.124, TK500-v3 before 1.0.123)Upgrade to a fixed version: 3.5.116, 1.0.124, 1.0.123.
Timeline
- CVE published
- First seen by cve.now
Affected versions
- Welotec TK100
From 0.0.0 · fixed in 3.5.116
- Welotec TK500-v2
From 0.0.0 · fixed in 1.0.124
- Welotec TK500-v3
From 0.0.0 · fixed in 1.0.123
Evidence 1
- Link
Corrections
None so far.
Something wrong on this page? Report an error. Every fix is listed here.
Questions about CVE-2026-105981
Is CVE-2026-105981 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 does this mean?
Improper input validation in the Digital I/O function lets operating system commands be injected into the router. The injected commands run with root privileges.Source: certvde.com
Which versions are affected by CVE-2026-105981?
TK100: from 0.0.0 before 3.5.116. TK500-v2: from 0.0.0 before 1.0.124. TK500-v3: from 0.0.0 before 1.0.123.Source: cve.now feed data
Am I affected, and how do I check?
Affected firmware is TK100/TK102 before 3.5.116, TK500-v2 before 1.0.124, and TK500-v3 before 1.0.123. The Digital I/O function must also be in use. To check, compare the router's firmware version with these numbers and confirm whether Digital I/O is in use.Source: certvde.com
How do I fix CVE-2026-105981?
Upgrade to TK100 3.5.116 or later, TK500-v2 1.0.124 or later, or TK500-v3 1.0.123 or later.Source: certvde.com