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CriticalCISA KEVExploited in the wildPublic exploit

SSRF in Accellion FTA wmProgressstat.html

IdentifiersCVE-2021-27103CWE-918· Server-Side Request Forgery (SSRF)

CVE-2021-27103 is a server-side request forgery (SSRF) vulnerability in Accellion File Transfer Appliance (FTA). It affects FTA 9_12_411 and earlier and can be triggered by an unauthenticated remote attacker via a specially crafted POST request to the wmProgressstat.html endpoint (also described in supporting content as the wmProgressstat file on a vulnerable FTA endpoint). The flaw allows attacker-controlled requests to be issued by the vulnerable appliance. This vulnerability was one of the Accellion FTA flaws publicly associated with real-world exploitation during the 2020–2021 Accellion incident set.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation can allow an attacker to abuse the Accellion FTA appliance as a proxy for unintended server-side requests. In the broader Accellion FTA intrusion activity described in the supporting content, exploitation of the FTA vulnerability set enabled attackers to access, view, and exfiltrate files from vulnerable FTA instances, and in some cases supported follow-on intrusion activity and extortion. The provided content does not attribute standalone remote code execution directly to CVE-2021-27103 by itself.

Mitigation

If you can’t patch tonight, do this now.

If immediate remediation is not possible, isolate or block internet access to systems hosting Accellion FTA, prioritize monitoring of the appliance for suspicious POST requests to wmProgressstat.html, review web and application logs for signs of exploitation, collect forensic images if compromise is suspected, audit FTA accounts and credentials, and reset security tokens as recommended in Accellion/CISA guidance for the broader FTA compromise activity. Because FTA is end-of-life, migration to a supported platform is the preferred long-term mitigation.

Remediation

Patch, then assume compromise.

Upgrade Accellion FTA to a fixed release. The provided content states the fixed version for CVE-2021-27103 is FTA_9_12_416 and later. Additional advisory content recommends updating FTA to FTA_9_12_432 or later as part of the broader Accellion response, and Accellion FTA was subsequently retired/end-of-life in April 2021. Where still present, organizations should migrate off FTA to a supported file-sharing platform in accordance with vendor guidance.
PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType
AccellionFtaapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

5 SOURCESView more in app
What this page doesn’t show

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Exposure mapping

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Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware2

Malware families riding this exploit, with evidence and IOCs.

Detection signatures1

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES
MITRE CVE
cve.org · CVE-2021-27103
NVD
nvd.nist.gov/vuln/detail/CVE-2021-27103
MITRE CWE · CWE-918
Server-Side Request Forgery (SSRF)
Product
accellion.com/products/fta
US Government Resource
cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-27103