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CVE-2021-35247— Improper Input Validation Vulnerability in Serv-U

Quick assessment

Affected

SolarWinds Serv-U

Exploitation

Confirmed exploitation in the wild; remediate immediately

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Solarwinds Serv-U Web Client是美国SolarWinds（Solarwinds）公司的一种基于 HTTP 的文件传输客户端，可供许可 Serv-U 文件服务器上的所有用户使用。 Solarwinds Serv-U Web Client 存在输入验证错误漏洞，该漏洞源于Serv-U web登录界面允许没有被认证机制消毒的字符。

CVSS 4.3 · Medium KEV EPSS 3.45% · P89 Updated Feb 25, 2026

In-the-Wild Activity Observed cisa_kev · confirmed

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

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I. Basic Information for CVE-2021-35247

Vulnerability Information

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Vulnerability Title

Improper Input Validation Vulnerability in Serv-U

Source: CVE Program / CVE List V5

Vulnerability Description

Serv-U web login screen to LDAP authentication was allowing characters that were not sufficiently sanitized. SolarWinds has updated the input mechanism to perform additional validation and sanitization. Please Note: No downstream affect has been detected as the LDAP servers ignored improper characters. To insure proper input validation is completed in all environments. SolarWinds recommends scheduling an update to the latest version of Serv-U.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Source: CVE Program / CVE List V5

Vulnerability Type

输入验证不恰当

Source: CVE Program / CVE List V5

Vulnerability Title

Solarwinds Serv-U Web Client 输入验证错误漏洞

Source: CNNVD (China National Vulnerability Database)

Vulnerability Description

Source: CNNVD (China National Vulnerability Database)

CVSS Information

N/A

Source: CNNVD (China National Vulnerability Database)

Vulnerability Type

N/A

Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
SolarWinds	Serv-U	15.2.5 and previous versions ~ 15.3	-

II. Public POCs for CVE-2021-35247

#	POC Description	Source Link	Shenlong Link

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No public POC found.

III. Intelligence Information for CVE-2021-35247

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Other References for CVE-2021-35247 (2)

https://www.solarwinds.com/trust-center/security-advisories/cve-2021-35247 x_refsource_MISC
https://documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_15-3_release_notes.htm x_refsource_MISC

https://www.cve.org/CVERecord?id=CVE-2021-35247

IV. Related Vulnerabilities

Same product: Serv-U

Same vendor: SolarWinds

Same weakness: CWE-20

V. Comments for CVE-2021-35247

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Goal Reached Thanks to every supporter — we hit 100%!

CVE-2021-35247— Improper Input Validation Vulnerability in Serv-U

Quick assessment

Possible ATT&CK Techniques 1 AI

I. Basic Information for CVE-2021-35247

Vulnerability Information

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Shenlong Deep Dive — AI Deep Analysis

Affected Products

II. Public POCs for CVE-2021-35247

III. Intelligence Information for CVE-2021-35247

Other References for CVE-2021-35247 (2)

IV. Related Vulnerabilities

V. Comments for CVE-2021-35247

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