CVE-2026-101038 — Fac1200r
CRITICALCVE-2026-101038 is a critical-severity (CVSS 9.9) Buffer Overflow vulnerability in fast fac1200r. No vendor fix is recorded yet; mitigation options are listed below.
A vulnerability was determined in FAST FAC1200R 5.0_20201119_1.0.2. Affected by this vulnerability is the function MmtAtePrase of the component MmtAtePrase Parser. This manipulation…
Exploitation Status
Proof-of-concept exploit code exists
- CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.
- A successful exploit gives an attacker total control of the affected component, not partial access.
Exploitation and automatability from CISA’s SSVC triage for CVE-2026-101038.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
CVE-2026-101038 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.
Where this sits among everything scored
Of 385,987 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.
Description
A vulnerability was determined in FAST FAC1200R 5.0_20201119_1.0.2. Affected by this vulnerability is the function MmtAtePrase of the component MmtAtePrase Parser. This manipulation causes stack-based buffer overflow. Remote exploitation of the attack is possible. The exploit has been publicly disclosed and may be utilized. The vendor was contacted early about this disclosure but did not respond in any way.
Affected Products
fac1200rfastDetection & mitigation playbook
Vendor / applianceDetect
Inventory every fast fac1200r deployment and check each version against the affected-products list above.
Remediation status
No patch has shipped for CVE-2026-101038 yet — track the fast fac1200r advisory for a fixed release and apply the workarounds below in the meantime.
Mitigate without a patch
Stop feeding it untrusted input: reject or quarantine files and payloads from unverified sources until you can upgrade, restrict accepted formats to the ones you actually need, and run the parsing or decoding step in a least-privileged sandbox or short-lived worker so a crash or corrupted read cannot reach the rest of the process. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.
Frequently Asked Questions
Is CVE-2026-101038 being exploited in your environment?
Detect and block the exploit chain at execution, on systems you cannot patch yet.