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CVE-2021-27103

Accellion FTA Server-Side Request Forgery (SSRF)

9.8 CRITICALActively exploited (CISA KEV)Used in ransomwareEPSS 11.4%
  1. Published16 Feb 2021
  2. Added to CISA KEV3 Nov 2021
  3. Remediation due17 Nov 2021
Actively exploited (CISA KEV)

Accellion FTA contains a server-side request forgery (SSRF) vulnerability exploited via a crafted POST request to wmProgressstat.html.

Added to KEV: 3 Nov 2021Federal remediation due: 17 Nov 2021Used in ransomware

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Accellion Fta< 9_12_416

Remediation

Fixed in
Accellion Fta≥ 9_12_416

References

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Frequently asked

Is CVE-2021-27103 being actively exploited?

Yes. CVE-2021-27103 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 3 Nov 2021. It has been used in ransomware campaigns.

How severe is CVE-2021-27103?

CVE-2021-27103 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 11.4% probability of exploitation.

Which products are affected by CVE-2021-27103?

Affected products include Accellion Fta.

How do I fix CVE-2021-27103?

Upgrade affected software to a fixed version, for example Accellion Fta 9_12_416 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2021-27103 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, a risk for it never ranks below high, and the update that fixes it moves to the Emergency patch lane. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.