The Node.js web service on VOS (previously Versa FlexVNF) is used for URL-based Zero Touch Provisioning (ZTP) of the VOS appliance and is…
- Exploited
- No known exploitation
- Fix
- No fix listed
- Who is exposed
- Specific setups only
Do first: Workaround: Disable the Nodejs web service on the VOS
- 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
- FIRST's estimate of the chance attackers exploit it in the next 30 days, updated daily.What do these mean? →
- 0.32% · 24th 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? →
- 21/100 · 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
- 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 Node.js web service on VOS (previously Versa FlexVNF), used for zero touch provisioning, has a flaw in its /authenticate endpoint that lets a remote attacker over the network run arbitrary shell commands as the versa OS service user. Exploitation requires a CSRF token from an unauthenticated page load and some user action, and the flaw cannot be exploited on VOS devices where this service has been disabled.
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
Read the original description
The Node.js web service on VOS (previously Versa FlexVNF) is used for URL-based Zero Touch Provisioning (ZTP) of the VOS appliance and is not required after provisioning is complete. The /authenticate endpoint of this service passes user-supplied username and password values to child_process.exec() through a sanitizer (escapeRegExp) that removes regular expression metacharacters but not newline characters. An unauthenticated attacker can inject a newline character into the username field to execute arbitrary shell commands as the versa OS service user. No credentials are required; the attacker needs only a CSRF token, which can be obtained from an unauthenticated page load.
Versa’s security hardening guide for Hubs, Branches, and Controllers recommends disabling the Node.js web service after the initial provisioning of the VOS device. This vulnerability is not exploitable on VOS devices where the Node.js web service has been disabled.
cve.now Index
- Exploitation?/40Unknown. No CISA SSVC exploitation rating yet
- Exposure8/25Specific setups only, reachable over the network
- Reach?/20Unknown. No tracked technology or package matched
- Severity7.6/10CVSS 7.6
- No patch5/5No patch listed yet
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
- Would score about 28 if CISA's SSVC rates it automatable
What to do
Workaround: Disable the Nodejs web service on the VOS
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-2026-107240 (The Node.js web service on VOS (previously Versa FlexVNF) is used for URL-based Zero Touch Provisioning (ZTP) of the VOS appliance and is…), 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-2026-107240 (entry last updated 2026-11-10): Affected: - Versa VOS: from 21.1.1, through 21.2.3 Fixed versions: none listed yet. Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory. Attacker needs: network access, high-privilege login, a user action. Workaround: Disable the Nodejs web service on the VOS (source: https://www.cve.org/CVERecord?id=CVE-2026-107240) CISA KEV: CVE-2026-107240 is not listed as of cve.now's last read. This KEV status is for CVE-2026-107240 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://security-portal.versa-networks.com/emailbulletins/6af2299bdd1c93ddc0a3e832 - https://www.cve.org/CVERecord?id=CVE-2026-107240 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-2026-107240 For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example get_vulnerability with id CVE-2026-107240.
Timeline
- CVE published
- First seen by cve.now
Affected versions
- Versa VOS
From 21.1.1 · through 21.2.3
Evidence 3
CVE record · 2
Establishes: The identifier and description.
- Record
- Record
Other links · 1
- Link
Corrections
None so far.
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Questions about CVE-2026-107240
Is CVE-2026-107240 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
Which versions are affected by CVE-2026-107240?
VOS: from 21.1.1 through 21.2.3.Source: cve.now feed data
How do I fix CVE-2026-107240?
No fixed version is listed in the checked facts. The stated mitigation is to disable the Node.js web service on the VOS.Source: cve.org
What if there's no patch?
Disable the Node.js web service on the VOS, as the advisory's mitigation says. This service is used for URL-based Zero Touch Provisioning, so turning it off also stops that provisioning method.Source: cve.org
Why do the sources disagree?
The description says the issue can be reached without authentication, but the CVSS vector lists PR:H, which means high privileges are required. The sources conflict on whether authentication is needed.Source: cve.org