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CVE-2021-27103

9.8, critical Known exploited Used in ransomware

Accellion FTA Server-Side Request Forgery (SSRF) Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab) CISA KEV catalogue (opens in a new tab)
CVSS
9.8, critical critical CVSS v3.1
EPSS, next 30 days
11% higher than 95.9% of scored CVEs
Exploitation
Confirmed in the wild
Published
16 Feb 20215 years ago

Known exploited

CISA added this to the Known Exploited Vulnerabilities Catalog on 3 Nov 2021 and links it to ransomware activity. US federal agencies had to remediate by 17 Nov 2021, a deadline that has passed.

Required action. Apply updates per vendor instructions.

Description

Accellion FTA 9_12_411 and earlier is affected by SSRF via a crafted POST request to wmProgressstat.html. The fixed version is FTA_9_12_416 and later.

Details

Vendor
Accellion
Product
FTA
Weakness
CWE-918 (opens in a new tab)
Status
Analyzed
Updated
17 Jun 2026
Assigner
cve@mitre.org

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References 3

Other references 3

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Accellion CVEs

Every Accellion CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2021-27101 Accellion FTA SQL Injection Vulnerability KEV EPSS 6% 9.8, critical
  • CVE-2021-27102 Accellion FTA OS Command Injection Vulnerability KEV EPSS 4% 7.8, high
  • CVE-2021-27104 Accellion FTA OS Command Injection Vulnerability KEV EPSS 57% 9.8, critical

Beyond this page

Is CVE-2021-27103 in your network?

This page tells you how dangerous CVE-2021-27103 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

CVE-2021-27103 is in the CISA catalogue of exploited vulnerabilities: attackers are already exploiting it.

  • EXYS7600 OCELOT

    Find it before attackers do

    Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2021-27103 comes with the devices to patch.

    Learn more about EXYS7600 OCELOT

  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

    Learn more about EXYS7950 KONDRA
Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.