CVE-2021-27103 Accellion FTA: web page flaw
In plain words: A web app can be made to act on someone's behalf or reach places it should not. Stolen sessions, actions taken as the victim, or access to internal systems.
Confirmed exploited by CISA on · US federal patch deadline Nov 17, 2021
What to do
- Install Accellion's security update for FTA. If no update exists, follow the vendor's workaround or stop using the product until one ships.
- Keep a list of every internet-facing server you run so nothing is forgotten.
- Patch anything in this catalog first, ahead of normal patch cycles.
- Put admin and file-transfer apps behind a VPN or single sign-on instead of the open internet.
Who is affected
Work IT. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.
What's at risk: Mass data theft and ransomware: a single flaw in a file-transfer or email server has exposed thousands of organisations at once.
The details
- Official name
- Accellion FTA Server-Side Request Forgery (SSRF) Vulnerability
- Product
- Accellion FTA
- CISA description
- Accellion FTA contains a server-side request forgery (SSRF) vulnerability exploited via a crafted POST request to wmProgressstat.html.
- Type of flaw
- Web page flaw (CWE-918)
- Confirmed exploited
- Nov 3, 2021 — known to be used in ransomware attacks
- US federal patch deadline
- Nov 17, 2021
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Answering about CVE-2021-27103 ·
Questions about CVE-2021-27103
Is CVE-2021-27103 being exploited?
Yes. CISA added CVE-2021-27103 to its Known Exploited Vulnerabilities catalog on Nov 3, 2021, which means there is reliable evidence of real-world attacks, including by ransomware groups.
How do I fix CVE-2021-27103?
Install Accellion's security update for FTA. If no update exists, follow the vendor's workaround or stop using the product until one ships. Keep a list of every internet-facing server you run so nothing is forgotten.
Am I affected by CVE-2021-27103?
Only if you use Accellion FTA. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.