CVE
C-Kermit remote command injection in REMOTE WHO and REMOTE SPACE
Affects C-Kermit before 11.1.515 when running in server mode. No vendor severity rating is given, and the fix is version 11.1.515.
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
- Exploited
- No known exploitation
- Fix
- Fixed in 11.1.515
- Who is exposed
- Default setups
Do first: Check every install: default setups are affected.
- Published
- Last modified
- Whether it needs action now or is a reference record, by fixed rules, with why. Last checked is when cve.now last re-read it.What do these mean? →
- Reference
- Last checked
- 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? →
- 31/100 · 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? →
- Default setups
- 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
C-Kermit, from OpenKermit, before version 11.1.515 has an OS command injection flaw in its REMOTE WHO and REMOTE SPACE commands. A remote attacker, without logging in, can append shell metacharacters to these arguments to run commands on the server host, even when DISABLE HOST is set.
Read the original description
C-Kermit before 11.1.515 contains an OS command injection vulnerability that allows remote clients to execute shell commands by supplying unquoted arguments to REMOTE WHO or REMOTE SPACE. Attackers can append shell metacharacters to arguments passed through WHOCMD or SPACM2 to syscmd(), executing commands on the server host even when DISABLE HOST is set.
Who should check
Teams running C-Kermit in server mode before 11.1.515, including anyone exposing a C-Kermit SERVER to remote clients with REMOTE WHO or REMOTE SPACE enabled
cve.now Index
- Exploitation?/40Unknown. No CISA SSVC exploitation rating yet
- Exposure22/25Default setups, reachable over the network without a login
- Reach?/20Unknown. No tracked technology or package matched
- Severity9.2/10CVSS 9.2
- No patch0/5No signal
What would change the score
- Would score about 71 if added to CISA KEV
- Would score about 66 if CISA's SSVC rates exploitation active
What to do
Check every install: default setups are affected.
Upgrade to a fixed version: 11.1.515.
Check your systems with an agent
Paste this into a coding or ops agent. It checks your systems read-only and reports a table per asset.
Check whether my systems are affected by CVE-2026-129124 (C-Kermit before 11.1.515 OS Command Injection via REMOTE WHO and REMOTE SPACE), using the cve.now data below.
Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only.
What cve.now has for CVE-2026-129124 (entry last updated 2026-11-13):
Affected:
- OpenKermit C-Kermit: fixed in 11.1.515
Fixed versions: 11.1.515.
Conditions (all must be true for the bug to be hit):
- Running C-Kermit before 11.1.515 (source: https://www.vulncheck.com/advisories/c-kermit-before-11.1.515-os-command-injection-via-remote-who-and-remote-space)
- C-Kermit running in server mode (source: https://github.com/OpenKermit/ckermit/security/advisories/GHSA-c5px-7h4c-gj8p)
Setup: the bug is reachable in a default setup; no special feature or setting is needed.
Attacker needs: network access, no login, no user action.
CISA KEV: CVE-2026-129124 is not listed as of cve.now's last read.
This KEV status is for CVE-2026-129124 only. If you also check another CVE, look up its own KEV status; never assume it from this one.
How to check:
- Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory.
Verify against the linked advisories before concluding, and cite the date you read each one:
- https://github.com/OpenKermit/ckermit/security/advisories/GHSA-c5px-7h4c-gj8p
- https://github.com/OpenKermit/ckermit/commit/29c4bfbe12d685f93668350c24291e562029ff57
- https://github.com/OpenKermit/ckermit/releases/tag/v11.1.515
- https://github.com/OpenKermit/ckermit/blob/v11.0.514/ckcpro.w#L1423
- https://www.vulncheck.com/advisories/c-kermit-before-11.1.515-os-command-injection-via-remote-who-and-remote-space
Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing.
Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action.
Entry: https://cve.now/CVE-2026-129124
For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example execute with name cve.get and arguments {"id": "CVE-2026-129124"}.Timeline
- CVE published
- First seen by cve.now
- Posted on X by cve.now
Affected versions
- OpenKermit C-Kermit
fixed in 11.1.515
Evidence 6
Vendor advisory · 1
Establishes: Affected and fixed versions.
- Advisory
Corrections
None so far.
Something wrong on this page? Report an error. Every fix is listed here.
Questions about CVE-2026-129124
Is CVE-2026-129124 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?
Remote clients can execute shell commands on the server host through the REMOTE WHO and REMOTE SPACE commands, even when DISABLE HOST is set.Source: vulncheck.com, github.com
Which versions are affected by CVE-2026-129124?
C-Kermit: before 11.1.515.Source: cve.now feed data
Am I affected, and how do I check?
C-Kermit versions before 11.1.515 running in server mode are affected. To check a installation, look at the C-Kermit version and whether it is running in server mode.Source: vulncheck.com, github.com
How do I fix CVE-2026-129124?
Upgrade C-Kermit to version 11.1.515 or later, which is the fixed version.Source: vulncheck.com, github.com