CVE-2021-27860
CVE-2021-27860 is a security flaw in FatPipe WARP, IPVPN, and MPVPN software. Attackers are using a flaw in FatPipe WARP, IPVPN, and MPVPN software. The US Cybersecurity and Infrastructure Security Agency (CISA) added it to its catalog of flaws known to be used in attacks on 10 Jan 2022.[1]
FatPipe WARP, IPVPN, and MPVPN software 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. Fixed in version 10.1.2r60p92 and 10.2.2r44p1.
Description
CISA calls it a WARP, IPVPN, and MPVPN configuration upload exploit in FatPipe WARP, IPVPN, and MPVPN software. In its words: “A vulnerability in the web management interface of FatPipe WARP, IPVPN, and MPVPN software allows a remote, unauthenticated attacker to upload a file to any location on the filesystem.”[1]
The CVE record adds: “A vulnerability in the web management interface of FatPipe WARP, IPVPN, and MPVPN software prior to versions 10.1.2r60p92 and 10.2.2r44p1 allows a remote, unauthenticated attacker to upload a file to any location on the filesystem. The FatPipe advisory identifier for this vulnerability is FPSA006.”[2]
The underlying weakness is unrestricted file upload (CWE-434), in MITRE’s list of common software weaknesses.
It scores 8.8 out of 10 on the Common Vulnerability Scoring System, which rates it high, scored by NVD using CVSS 3.1.[2]
Affected versions
NVD’s record lists these fixed versions: in each line, everything before the version shown is affected.[2]
| Product | Fixed in |
|---|---|
| WARP | 10.1.2r60p92 |
| WARP | 10.2.2r44p1 |
| IPVPN | 10.1.2r60p92 |
| IPVPN | 10.2.2r44p1 |
| MPVPN | 10.1.2r60p92 |
| MPVPN | 10.2.2r44p1 |
Most families won’t have FatPipe WARP, IPVPN, and MPVPN software; it’s for whoever looks after IT at work.
Exploitation
CISA added it to its catalog of known exploited vulnerabilities on 10 Jan 2022, 33 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 24 Jan 2022 to fix it.[1]
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 40%. That’s in the top 2% 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
FatPipe has published a fix or advice.[3] CISA’s required action: “Apply updates per vendor instructions.”[1]
- Check whether you use it.FatPipe WARP, IPVPN, and MPVPN software 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 (fixed in version 10.1.2r60p92 and 10.2.2r44p1), or not in use. CISA gave US government agencies until 24 Jan 2022 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 8.8.[2] | |
| CISA adds it to its catalog of flaws known to be used in attacks.[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 40%.[4] |
See also
Other unrestricted file upload flaws
- CVE-2026-48356, Adobe Commerce and Magento: unrestricted upload of file with dangerous type ·
- CVE-2026-56291, Balbooa Forms: unrestricted upload of file with dangerous type ·
- CVE-2026-48939, iCagenda: unrestricted upload of file with dangerous type ·
- CVE-2026-48908, JoomShaper SP Page Builder: unrestricted upload of file with dangerous type ·
- CVE-2024-7694, TeamT5 ThreatSonar Anti-Ransomware: unrestricted upload of file with dangerous type ·
Added the same day
- CVE-2021-36260, Hikvision Security cameras web server: improper input validation ·
- CVE-2021-22017, VMware vCenter Server: improper access control ·
- CVE-2020-6572, Google Chrome Media: use-after-free ·
- CVE-2019-9670, Synacor Zimbra Collaboration Suite (ZCS): improper restriction of XML external entity reference ·
- CVE-2019-7609, Elastic Kibana: arbitrary code execution ·
References
- ^ Cybersecurity and Infrastructure Security Agency. “FatPipe WARP, IPVPN, and MPVPN Configuration Upload exploit”. Known Exploited Vulnerabilities Catalog, added 10 Jan 2022.
- ^ National Institute of Standards and Technology. “CVE-2021-27860 Detail”. National Vulnerability Database, published 8 Dec 2021.
- ^ FatPipe. Advisories and fixes: fatpipeinc.com.
- ^ FIRST. “Exploit Prediction Scoring System”. EPSS 0.397, percentile 98.6, 31 Oct 2026.
- CVE Program. “CVE-2021-27860”. 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.