CVE-2021-35211

SolarWinds Serv-U Remote Code Execution Vulnerability

Severity Score

10.0

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

Yes

*KEV

Decision

*SSVC

Descriptions

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.

Microsoft descubrió una vulnerabilidad de ejecución de código remota (RCE) en el producto SolarWinds Serv-U usando una Vulnerabilidad de Escape de Memoria Remota. Si es explotado, un actor de la amenaza puede ser capaz de obtener acceso privilegiado a la máquina que aloja Serv-U solamente. SolarWinds Serv-U Managed File Transfer y Serv-U Secure FTP para Windows versiones anteriores a 15.2.3 HF2 están afectados por esta vulnerabilidad

SolarWinds Serv-U contains an unspecified memory escape vulnerability which can allow for remote code execution.

*Credits: SolarWinds would like to thank the Microsoft Threat Intelligence Center (MSTIC) and Microsoft Offensive Security Research teams for reporting on the issue in a responsible manner.

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

Complete

Integrity

Complete

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-06-22 CVE Reserved
2021-07-14 CVE Published
2021-09-30 First Exploit
2021-11-03 Exploited in Wild
2021-11-17 KEV Due Date
2024-09-13 EPSS Updated
2024-09-16 CVE Updated

CWE

CWE-787: Out-of-bounds Write

CAPEC

References (5)

URL	Tag	Source

URL	Date	SRC
https://github.com/BishopFox/CVE-2021-35211	2022-01-14
https://github.com/NattiSamson/Serv-U-CVE-2021-35211	2021-09-30
https://github.com/0xhaggis/CVE-2021-35211	2021-11-12

URL	Date	SRC
https://www.microsoft.com/security/blog/2021/07/13/microsoft-discovers-threat-actor-targeting-solarwinds-serv-u-software-with-0-day-exploit	2023-08-08
https://www.solarwinds.com/trust-center/security-advisories/cve-2021-35211	2023-08-08

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Solarwinds Search vendor "Solarwinds"		Serv-u Search vendor "Solarwinds" for product "Serv-u"				< 15.2.3 Search vendor "Solarwinds" for product "Serv-u" and version " < 15.2.3"		-		Affected
Solarwinds Search vendor "Solarwinds"		Serv-u Search vendor "Solarwinds" for product "Serv-u"				15.2.3 Search vendor "Solarwinds" for product "Serv-u" and version "15.2.3"		-		Affected
Solarwinds Search vendor "Solarwinds"		Serv-u Search vendor "Solarwinds" for product "Serv-u"				15.2.3 Search vendor "Solarwinds" for product "Serv-u" and version "15.2.3"		hotfix1		Affected