CVE-2021-35211
Published: November 3, 2021
Official Description
SolarWinds Serv-U contains an unspecified memory escape vulnerability which can allow for remote code execution.
CISA KEV Advisory
SolarWinds Serv-U Remote Code Execution Vulnerability
SolarWinds Serv-U contains an unspecified memory escape vulnerability which can allow for remote code execution.
Apply updates per vendor instructions.
Risk Analysis
This unspecified memory escape vulnerability in SolarWinds Serv-U can lead to remote code execution. The high EPSS score of 0.94321 indicates a very high likelihood of exploitation, making this a critical vulnerability.
This vulnerability is actively exploited in the wild and is included in CISA's KEV catalog. This confirms that threat actors are leveraging this flaw for malicious purposes.
Apply the latest security patches provided by SolarWinds for Serv-U. Implement network segmentation and restrict access to Serv-U instances to minimize exposure.
Technical Analysis
CVE-2021-35211 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CISA has added CVE-2021-35211 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.
Exploit & PoC Resources
All References (1)
Quick Facts
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2021-35211 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
- !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
- !Active exploitation confirmed — treat as P1