Critical severity · published Jul 14, 2021
CVE-2021-35211
Serv-U Remote Memory Escape Vulnerability
RansomwareIn wildKEV
10.0
CVSS
91.2%
EPSS
Yes
On KEV
Description
Microsoft discovered a remote code execution (RCE) vulnerability in the SolarWinds Serv-U product utilizing a Remote Memory Escape Vulnerability. If exploited, a threat actor may be able to gain privileged access to the machine hosting Serv-U Only. SolarWinds Serv-U Managed File Transfer and Serv-U Secure FTP for Windows before 15.2.3 HF2 are affected by this vulnerability.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)91.2% · higher than 100% of CVEs
Exploited in the wildYes
CISA KEVListed Nov 3, 2021
Federal remediation dueNov 17, 2021
Ransomware campaign useKnown
Affected products
Which versions
SE
Serv-U · SolarWinds
before 15.2.3; 15.2.3; 15.2.3 · source: NVD, KEV
SM
Serv-U Managed File Transfer Server and Serv-U Secured FTP · SolarWinds
SolarWinds Serv-U before 15.2.3 HF1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-35211
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-35211
CISA KEV catalogue
https://www.cisa.gov/known-exploited-vulnerabilities-catalog
x_refsource_MISC
https://www.solarwinds.com/trust-center/security-advisories/cve-2021-35211
x_refsource_MISC
https://www.microsoft.com/security/blog/2021/07/13/microsoft-discovers-threat-actor-targeting-solarwinds-serv-u-software-with-0-day-exploit
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