Page generated: 09 Nov 2026, 02:44 UTC
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CVE-2021-27104

Accellion FTA 9_12_370 and earlier is affected by OS command execution via a crafted POST request to various admin endpoints. The fixed version is FTA_9_12_380 and later.

CVSS 9.8 (CRITICAL) KEV: KNOWN CATALOG

Attention and evidence

HYPE SCORE
0.0/10
REALITY · THREAT PRIORITY
8.8/10
General review priority; not probability

Evidence confidence: Exploitation recorded

Why this priority?
  • Recorded exploitation baseline: +7.00
  • Technical severity: CVSS 9.8: +1.47
  • Fresh EPSS: 56.69%: +0.28

General review priority, not probability, victim count or asset-specific risk. A range covers missing CVSS/EPSS inputs within the current evidence state.

Sources: 11 documents and public datasets.

Hype components

Headline sample (25%)
0/100
Press, 30 days (60%)
0/100
Grounded branding (15%)
0/100
HYPE TOTAL0/100

Sources and documents

CyberSecurityNews
Press · 25 Sep 2025, 07:00 · ZendTo Vulnerability Let Attackers Bypass Security Controls and Access Sensitive Data - CyberSecurityNews
SECURITY.COM
Press · 19 Jan 2022, 08:00 · The Threat Landscape in 2021 - SECURITY.COM
The Hacker News
Press · 29 Jul 2021, 07:00 · Top 30 Critical Security Vulnerabilities Most Exploited by Hackers - The Hacker News
Qualys
Press · 28 Jul 2021, 07:00 · CISA Alert: Top Routinely Exploited Vulnerabilities - Qualys
Unit 42
Press · 13 Apr 2021, 07:00 · Threat Assessment: Clop Ransomware - Unit 42
See all 11 source documents
Recorded Future
Press · 12 Mar 2021, 08:00 · Understanding Accellion’s FTA Appliance Compromise, DEWMODE, and Its Supply Chain Impact - Recorded Future
Kaspersky
Press · 10 Mar 2021, 08:00 · Hackers publish data stolen through Accellion FTA - Kaspersky
The Hacker News
Press · 04 Mar 2021, 08:00 · Extortion Gang Breaches Cybersecurity Firm Qualys Using Accellion Exploit - The Hacker News
The HIPAA Journal
Press · 25 Feb 2021, 08:00 · CISA Warns of Active Exploitation of Accellion File Transfer Appliance Vulnerabilities - The HIPAA Journal
The Hacker News
Press · 23 Feb 2021, 08:00 · Hackers Exploit Accellion Zero-Days in Recent Data Theft and Extortion Attacks - The Hacker News
Google Cloud
Press · 22 Feb 2021, 08:00 · Cyber Criminals Exploit Accellion FTA for Data Theft and Extortion - Google Cloud

Score evolution

● Hype   ● Reality

Earlier evidence-support scores are retained in history; this chart shows only the current priority definition.

First record: hype 0.0 · reality 8.8 (2026-11-02 15:12). The curve appears once the score changes.

Public exploit evidence

0

Public exploit entries / repo candidates

Evidence context and dated references

Reality is general threat/review priority, combining observed exploitation, CVSS severity and fresh EPSS. Evidence confidence is separate. This is not calibrated risk, a victim count or an asset-specific assessment. A range reflects missing numeric inputs.

Evidence in context

Confidence in exploitation evidence
Exploitation recorded
Priority basis
Recorded exploitation; CVSS 9.8; EPSS 56.7%
Attention, last 30 days
0 distinct story titles; 0 press documents; 0 publisher domains.
Technical potential
network access, no prior privileges, no user interaction.
Observed activity
Exploitation recorded in CISA KEV.
Known scale
Not quantified.
Evidence confidence basis
Trusted exploitation confirmation

Score evaluated: 2026-11-05 13:58:25.853394+00:00 · EPSS snapshot: 2026-11-05T12:03:04Z

Source event timeline
Published
16 Feb 2021, 20:16
First press mention
22 Feb 2021, 08:00
Added to the CISA KEV catalog
03 Nov 2021, 00:00
Latest press mention
25 Sep 2025, 07:00
Score calculated
05 Nov 2026, 13:58