What is CVE-2021-27101?
Accellion FTA 9_12_370 and earlier is affected by SQL injection via a crafted Host header in a request to document_root.html. The fixed version is FTA_9_12_380 and later.
Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. The identifier was first published 2062 days ago.
Severity and exploitation probability
- CVSS v3.1 base score
- 9.8 — CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS (FIRST)
- 5.9% probability of exploitation in the next 30 days, higher than 93.1% of all scored CVEs
- CISA KEV
- Listed since 2021-11-03, federal remediation deadline 2021-11-17 — used in known ransomware campaigns
- Threadlinqs priority
- 10/10 — CISA lists it as used in ransomware, which Threadlinqs scores at the maximum
- Published
- 2021-02-16, last modified 2025-10-21
Is CVE-2021-27101 being exploited?
CISA added CVE-2021-27101 to the Known Exploited Vulnerabilities catalog on 2021-11-03, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2021-11-17 under BOD 22-01. CISA flags the vulnerability as one used in known ransomware campaigns. Weaponised exploit code for CVE-2021-27101 is publicly available. 2 public proof-of-concept repositories are tracked for this identifier. It currently carries a trending score of 46 in the Threadlinqs vulnerability feed.
- luel-4013/misfortune-cookie (github)
- trickest/cve (trickest)
Affected products and versions
No affected-product or package list has been recorded for CVE-2021-27101 in the tracked sources. The vendor advisory and the references below are the authoritative statement of what is affected.
How to fix CVE-2021-27101
Because CVE-2021-27101 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2021-11-17. No vendor patch reference has been recorded for CVE-2021-27101 in the tracked sources. Follow the references below for a fix, and treat any affected deployment as exposed until the vendor states otherwise.
Threat activity tracking CVE-2021-27101
1 tracked threat in the Threadlinqs corpus references CVE-2021-27101, either in the campaign’s CVE list or as an indicator on the campaign record.
Sources
Enriched from CVE.org, FIRST EPSS, CISA KEV, GitHub Security Advisories, public proof-of-concept repositories. Last verified by Threadlinqs on .