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What is CVE-2025-10035?
Fortra’s September 18, 2025 advisory describes a critical deserialization vulnerability in the License Servlet of GoAnywhere Managed File Transfer (MFT). An attacker able to provide a validly forged license-response signature could cause an attacker-controlled object to be deserialized, potentially leading to command injection. Fortra assigned the issue a CVSS 3.1 score of 10.0. Fortra’s advisory
Fortra identified exposure of the GoAnywhere Admin Console to the public internet as central to the risk and told customers to ensure it was not publicly accessible. Internet exposure increases the opportunity for attackers to reach the vulnerable service; it does not mean every exposed installation was compromised.
What did Fortra and security responders report?
The published accounts describe different scopes of observation and should not be combined into a single victim tally.
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- Fortra: The company said it began investigating a customer report on September 11, 2025. It reviewed logs and exposure of on-premises consoles as well as hosted MFTaaS instances. It identified three hosted instances with potentially suspicious activity, isolated them, contacted the customers, and contacted law enforcement. On October 9, Fortra said it had a limited number of reports of unauthorized activity related to the CVE. Fortra’s investigation summary
- Microsoft: On October 6, Microsoft Threat Intelligence reported exploitation it attributed to Storm-1175, a group it described as known for deploying Medusa ransomware and exploiting public-facing applications for initial access. Microsoft said related activity was observed on September 11, 2025, and described activity across multiple organizations. Microsoft’s threat report
- CISA: On September 29, 2025, CISA added CVE-2025-10035 to its Known Exploited Vulnerabilities (KEV) catalog, citing evidence of active exploitation. KEV inclusion is a prioritization signal; it is not a public count of compromised systems. CISA’s KEV catalog
What did Microsoft observe during exploitation?
Microsoft’s account describes tools and actions seen in the environments it investigated, not a universal sequence for every incident. It reported attackers using SimpleHelp and MeshAgent remote-management tools for persistence, creating JSP files in GoAnywhere directories, and conducting system and user discovery. Microsoft also observed Remote Desktop use for lateral movement, Rclone for data exfiltration in at least one victim environment, and Medusa ransomware deployment in one compromised environment. Microsoft’s report
These details can help incident responders prioritize searches, but absence of any one named tool or behavior does not establish that an installation is clean.
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Which releases fixed this CVE, and what should operators install now?
Fortra’s September 2025 investigation summary says it created a hotfix for 7.6.x, 7.7.x, and 7.8.x on September 12, then posted full patched releases 7.6.3 and 7.8.4 on September 15. It said hosted MFTaaS instances were upgraded to 7.8.4 by September 17. Those are the historical releases identified as fixing CVE-2025-10035; they should not be treated as the latest current releases. Fortra’s investigation summary
Fortra’s advisory index, checked September 28, 2026, lists later security advisories, including a September 9, 2026 advisory for versions prior to 7.10.2. Confirm the supported upgrade path and current security requirements in Fortra’s current advisory index rather than stopping at the 2025 CVE fix version.
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How to reduce risk and check for possible compromise
- Remove public exposure. Restrict the GoAnywhere Admin Console so it is not accessible from the public internet, as Fortra advises. Use the network controls appropriate to your deployment, and verify that external access is blocked.
- Upgrade using Fortra’s current supported path. Apply an applicable patched release and follow the vendor’s current upgrade guidance. The September 2025 fix releases were 7.6.3 and 7.8.4; later advisories mean those historical numbers alone do not establish that an installation is currently up to date.
- Review Admin Audit logs. Look for suspicious or unexpected administrative activity around the period the system was exposed or potentially vulnerable.
- Search
userdata/logs/for exception traces containingSignedObject.getObject. Fortra identifies this string in an exception stack trace as a possible indication that an instance was affected. Treat it as an investigative lead, not proof of compromise by itself. Fortra’s advisory - Escalate if exposure or suspicious activity is plausible. Microsoft cautions that installing an update does not undo an earlier intrusion. Preserve relevant logs and investigate the host and connected environment; involve your incident-response team if evidence or credible risk of compromise is present. Microsoft’s report
What the public reports do—and do not—establish
The available statements establish Fortra’s response actions, Microsoft’s reported observations, and CISA’s active-exploitation designation. They do not establish a comprehensive global victim count, prove that every publicly exposed installation was compromised, or show that every incident involved the same tools or ransomware. Assess your own system’s exposure and evidence rather than inferring its status from another organization’s report.
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