CVE-2025-10035
CVE-2025-10035 is a security flaw in Fortra GoAnywhere MFT. Attackers can run their own code on Fortra GoAnywhere MFT. The US Cybersecurity and Infrastructure Security Agency (CISA) added it to its catalog of flaws known to be used in attacks on 29 Sep 2025, and says ransomware gangs have used it.[1]
Fortra GoAnywhere MFT is business software or equipment. Most families won’t have it, but attackers break into it to get inside companies, and from there to what those companies hold about their customers, patients and staff. Fortra has published a fix or advice.
Description
CISA calls it a deserialization of untrusted data in Fortra GoAnywhere MFT. In its words: “Fortra GoAnywhere MFT contains a deserialization of untrusted data vulnerability allows an actor with a validly forged license response signature to deserialize an arbitrary actor-controlled object, possibly leading to command injection.”[1]
The underlying weakness is deserialization of untrusted data (CWE-502), command injection (CWE-77), in MITRE’s list of common software weaknesses.[2]
It scores 9.8 out of 10 on the Common Vulnerability Scoring System, which rates it critical, scored by NVD using CVSS 3.1.[2]
Affected versions
NVD’s record doesn’t list version ranges for it; Fortra’s advisory has them[3]. CISA names the product as Fortra GoAnywhere MFT.
Most families won’t have Fortra GoAnywhere MFT; it’s for whoever looks after IT at work.
Exploitation
CISA added it to its catalog of known exploited vulnerabilities on 29 Sep 2025, 11 days after it was made public. CISA lists a flaw only when it has reliable evidence of it being exploited, and gave US federal agencies until 20 Oct 2025 to fix it.[1] CISA says ransomware gangs have used it.
FIRST’s Exploit Prediction Scoring System, which estimates how likely a flaw is to be used in attacks in the next 30 days from what it sees across the internet, puts it at over 99%. That’s in the top 1% of the flaws it scores.[4]
CISA assesses it as automatable: attackers can run it against many targets at once.
CISA doesn’t say who was attacked, or how.
Fix
Fortra has published a fix or advice.[3] CISA’s required action: “Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.”[1]
- Check whether you use it.Fortra GoAnywhere MFT is business software or equipment, so most families won’t have it. If you run a business, or work from home on company equipment, ask whoever looks after your IT.
- Send this page to your IT person.Ask them to confirm it’s fixed, or not in use. CISA gave US government agencies until 20 Oct 2025 to fix it.
- If it can’t be fixed, take it offline.CISA’s advice when there’s no fix is to stop using the product, or take it off the internet, until there is one.
You can’t fix someone else’s server, but you can watch for what follows a break-in like this: a breach notice, a password reset you didn’t ask for, or a scam message that knows things it shouldn’t. HARD watches for those for you and your family.
Timeline
| Date | Event |
|---|---|
| The flaw is made public in the National Vulnerability Database, with a severity score of 9.8.[2] | |
| CISA adds it to its catalog of flaws known to be used in attacks, noting that ransomware gangs have used it.[1] | |
| CISA’s deadline for US government agencies to fix it.[1] | |
| FIRST puts the odds of it being used in attacks in the next 30 days at over 99%.[4] |
See also
Other Fortra GoAnywhere MFT flaws
- CVE-2023-0669: remote code execution ·
Other Fortra flaws
- CVE-2022-42948, Fortra Cobalt Strike: user interface remote code execution ·
- CVE-2022-39197, Fortra Cobalt Strike: teamserver cross-site scripting (XSS) ·
Other deserialization of untrusted data flaws
- CVE-2021-23758, Ajax.NET Professional: deserialization of untrusted data ·
- CVE-2026-63077, JetBrains TeamCity: deserialization of untrusted data ·
- CVE-2026-50522, Microsoft SharePoint: deserialization of untrusted data ·
- CVE-2026-58644, Microsoft SharePoint: deserialization of untrusted data ·
- CVE-2026-45659, Microsoft SharePoint Server: deserialization of untrusted data ·
Added the same day
- CVE-2025-59689, Libraesva Email Security Gateway: command injection ·
- CVE-2025-32463, Sudo: inclusion of functionality from untrusted control sphere ·
- CVE-2025-20352, Cisco IOS and IOS XE: software SNMP denial of service and remote code execution ·
- CVE-2021-21311, Adminer: server-side request forgery ·
Every Fortra flaw on CISA’s list · Everything added in September 2025
References
- ^ Cybersecurity and Infrastructure Security Agency. “Fortra GoAnywhere MFT Deserialization of Untrusted Data Vulnerability”. Known Exploited Vulnerabilities Catalog, added 29 Sep 2025.
- ^ National Institute of Standards and Technology. “CVE-2025-10035 Detail”. National Vulnerability Database, published 18 Sep 2025.
- ^ Fortra. Advisories and fixes: fortra.com.
- ^ FIRST. “Exploit Prediction Scoring System”. EPSS 0.998, percentile 100.0, 31 Oct 2026.
- CVE Program. “CVE-2025-10035”. The official CVE record.
This article is built from CISA’s catalog (version 2026.10.30), NVD’s record and FIRST’s scores, kept in HARD’s database and checked every morning. The plain English is HARD’s.