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Critical deserialization flaw in GoAnywhere MFT (CVE-2025-10035) patched

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4 unique sources, 9 articles

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The critical deserialization vulnerability (CVE-2025-10035) in GoAnywhere MFT has been actively exploited by the cybercrime group Storm-1175 in Medusa ransomware attacks since at least September 11, 2025. This flaw, rated 10.0 on the CVSS scale, allows for arbitrary command execution if the system is publicly accessible over the internet. Fortra has released patches in versions 7.8.4 and 7.6.3. The vulnerability was disclosed on September 18, 2025, but exploitation began a week earlier. The Shadowserver Foundation is monitoring over 513 GoAnywhere MFT instances exposed online, although the number of patched instances is unknown. The flaw impacts the same license code path as the earlier CVE-2023-0669, which was widely exploited by multiple ransomware and APT groups in 2023, including LockBit. The vulnerability enables an attacker to bypass signature verification by crafting a forged license response signature, allowing the deserialization of arbitrary, attacker-controlled objects. Successful exploitation could result in command injection and potential remote code execution (RCE) on the affected system. The threat actor used legitimate remote monitoring and management (RMM) tools SimpleHelp and MeshAgent to launch binaries following exploitation. The threat actor utilized RMM tools to establish command-and-control (C2) infrastructure and set up a Cloudflare tunnel for secure C2 communication. The deployment and execution of Rclone was observed in at least one victim environment during the exfiltration stage. Medusa ransomware has over 300 global victims in critical infrastructure sectors, including a confirmed attack on a US healthcare organization in early 2025. Fortra began investigating the vulnerability on September 11, 2025, following a customer report. Fortra contacted on-premises customers with publicly accessible admin consoles and notified law enforcement on September 11, 2025. A hotfix for versions 7.6.x, 7.7.x, and 7.8.x was released on September 12, 2025. Full patches for versions 7.6.3 and 7.8.4 were released on September 15, 2025. The CVE for the vulnerability was formally published on September 18, 2025. Fortra confirmed a limited number of reports of unauthorized activity related to CVE-2025-10035. Fortra recommends restricting admin console access over the internet and enabling monitoring. watchTowr CEO and founder Benjamin Harris reiterated the need for transparency from Fortra regarding the private keys used in the exploit.

Timeline

  1. 10.10.2025 14:42 1 articles · 5d ago

    Fortra confirms unauthorized activity related to CVE-2025-10035

    Fortra has confirmed a limited number of reports of unauthorized activity related to CVE-2025-10035. The company recommends restricting admin console access over the internet and enabling monitoring to mitigate the risk. watchTowr CEO and founder Benjamin Harris called for transparency from Fortra regarding how the threat actors obtained the private keys needed to exploit the vulnerability.

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  2. 06.10.2025 21:11 3 articles · 8d ago

    Storm-1175 exploits GoAnywhere flaw in Medusa ransomware attacks

    watchTowr CEO and Founder, Benjamin Harris, stated that organizations running GoAnywhere MFT have been under silent assault since at least September 11, 2025. watchTowr CEO and Founder, Benjamin Harris, called for transparency from Fortra regarding how threat actors obtained the private keys needed to exploit the vulnerability and why organizations were left in the dark for so long.

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  3. 26.09.2025 12:22 4 articles · 19d ago

    Exploitation of CVE-2025-10035 in GoAnywhere MFT confirmed

    The Shadowserver Foundation is monitoring over 513 GoAnywhere instances currently exposed, with 363 located in North America.

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  4. 19.09.2025 17:12 9 articles · 26d ago

    Critical deserialization flaw in GoAnywhere MFT (CVE-2025-10035) patched

    The attack chain following initial access entails dropping remote monitoring and management (RMM) tools, such as SimpleHelp and MeshAgent, to maintain persistence. The threat actors have also been observed creating .jsp files within the GoAnywhere MFT directories, often at the same time as the dropped RMM tools. In the next phase, commands for user, network, and system discovery are executed, followed by leveraging mstsc.exe (i.e., Windows Remote Desktop Connection) for lateral movement across the network. The downloaded RMM tools are used for command-and-control (C2) using a Cloudflare tunnel, with Microsoft observing the use of Rclone in at least one victim environment for data exfiltration. The attack ultimately paves the way for the Medusa ransomware deployment. Fortra began investigating the vulnerability on September 11, 2025, following a customer report. Fortra contacted on-premises customers with publicly accessible admin consoles and notified law enforcement on September 11, 2025. A hotfix for versions 7.6.x, 7.7.x, and 7.8.x was released on September 12, 2025. Full patches for versions 7.6.3 and 7.8.4 were released on September 15, 2025. The CVE for the vulnerability was formally published on September 18, 2025. Fortra confirmed a limited number of reports of unauthorized activity related to CVE-2025-10035. Fortra recommends restricting admin console access over the internet and enabling monitoring. watchTowr CEO and founder Benjamin Harris reiterated the need for transparency from Fortra regarding the private keys used in the exploit.

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