CVE-2021-27103Known exploitationNetwork attack vector

Unauthenticated SSRF via crafted POST request

Published Feb 16, 2021 · Updated Oct 21, 2025

Server-side request forgery in Accellion FTA 9_12_411 and earlier allows remote attackers to send requests via crafted POST data. The wmProgressstat.html endpoint accepts attacker-controlled POST input and uses it to initiate server-side requests without adequately restricting the destination. No authentication or user interaction is required, and exploitation can reach resources accessible from the appliance's network position.

CVSS severity9.8
Critical
EPSS probability11.41%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Server-side request forgery in Accellion FTA 9_12_411 and earlier allows remote attackers to send requests via crafted POST data. The wmProgressstat.html endpoint accepts attacker-controlled POST input and uses it to initiate server-side requests without adequately restricting the destination. No authentication or user interaction is required, and exploitation can reach resources accessible from the appliance's network position.

The record

CVE
CVE-2021-27103
Published
Feb 16, 2021
Updated
Oct 21, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-918, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 16, 2021CVE publishedPublication date reported by the CVE source.
  2. Oct 21, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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