Vulnerability identifier: #VU59659

Vulnerability risk: Low

CVSSv3.1: 5.1 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:H/RL:O/RC:C]

CVE-ID: CVE-2021-35247

CWE-ID: CWE-90

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Serv-U FTP Server
Server applications / File servers (FTP/HTTP)

Vendor: SolarWinds

Description

The vulnerability allows a remote attacker to send unexpected characters to the LDAP server.

The vulnerability exists due to improper input validation when processing DLAP queries in Serv-U web login screen. A remote non-authenticated attacker can send a specially crafted request that can bypass implemented filtration and influence the initial LDAP query.

Note: No downstream affect has been detected as the LDAP servers ignored improper characters.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Serv-U FTP Server: 15.1 - 15.2.5

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External links
http://www.solarwinds.com/trust-center/security-advisories/cve-2021-35247

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.