Vulnerability Details : CVE-2021-35211
Used for ransomware!
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.
Vulnerability category: Execute code
Products affected by CVE-2021-35211
- cpe:2.3:a:solarwinds:serv-u:*:*:*:*:*:*:*:*
- cpe:2.3:a:solarwinds:serv-u:15.2.3:-:*:*:*:*:*:*
- cpe:2.3:a:solarwinds:serv-u:15.2.3:hotfix1:*:*:*:*:*:*
CVE-2021-35211 is in the CISA Known Exploited Vulnerabilities Catalog
This issue is known to have been leveraged as part of a ransomware campaign.
CISA vulnerability name:
SolarWinds Serv-U Remote Code Execution Vulnerability
CISA required action:
Apply updates per vendor instructions.
CISA description:
SolarWinds Serv-U contains an unspecified memory escape vulnerability which can allow for remote code execution.
Notes:
https://nvd.nist.gov/vuln/detail/CVE-2021-35211
Added on
2021-11-03
Action due date
2021-11-17
Exploit prediction scoring system (EPSS) score for CVE-2021-35211
93.01%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 99 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-35211
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
10.0
|
HIGH | AV:N/AC:L/Au:N/C:C/I:C/A:C |
10.0
|
10.0
|
NIST | |
|
10.0
|
CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
3.9
|
6.0
|
NIST | |
|
9.0
|
CRITICAL | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H |
2.2
|
6.0
|
SolarWinds |
References for CVE-2021-35211
-
https://www.solarwinds.com/trust-center/security-advisories/cve-2021-35211
SolarWinds Trust Center Security Advisories | CVE-2021-35211Patch;Vendor Advisory
-
https://www.microsoft.com/security/blog/2021/07/13/microsoft-discovers-threat-actor-targeting-solarwinds-serv-u-software-with-0-day-exploit
Microsoft discovers threat actor targeting SolarWinds Serv-U software with 0-day exploit | Microsoft Security BlogPatch;Vendor Advisory
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