CVSS—
Severityhigh
Weakness—
EPSS6.0%93.3th percentile
Exploited3 KEV sources
Ransomware useKnown
Federal fix dueNov 17, 2021
patch window
Called exploited 56 days after disclosure.
Measured from the CVE publication date to the earliest of 3 KEV catalogues that list it.
The life of this vulnerability
- CVE published
- First KEV listing56d
- Last KEV listing7mo
- Last sighting4.8y
Gaps are compressed to equal steps. The elapsed time is printed under each.
Which catalogues call it exploited
- CISA KEVUS federallisted Nov 3, 2021
- EUVDENISA, European Unionlisted Nov 3, 2021
- VulnCheck KEVcommercial researchlisted Apr 13, 2021
- CIRCLaggregator, mirrors the abovelisted Nov 3, 2021, not counted
Sources3 of 3
Listings differ by204 d
Strongest claimconfirmed
3 catalogues list it. CIRCL aggregates the others and is shown but not counted.
Public exploitation evidence
- reported exploitationreliaquest.com/blog/clop-returns-with-custom-implant-in-mass
- reported exploitationhs-24091716.f.hubspotemail.net/hubfs/24091716/UltraViolet-20
- reported exploitationwww.guidepointsecurity.com/blog/the-economics-of-clops-zero-
- reported exploitationwww.crowdstrike.com/explore/2026-global-threat-report
- reported exploitationwww.loginsoft.com/reports/annually/vulnerability-intelligenc
- reported exploitationslcyber.io/whitepapers-reports/an-escalation-in-attacks-the-
26 public reports collected from VulnCheck and CIRCL, first on Apr 13, 2021. Each links to its original source. We have not verified them.
Description
Accellion FTA contains a SQL injection vulnerability exploited via a crafted host header in a request to document_root.html.
Required action (CISA)
Apply updates per vendor instructions.
