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CVE-2021-35247

4.3 · MEDIUMActively Exploited

Serv-U web login screen to LDAP authentication was allowing characters that were not sufficiently sanitized.

Published Jan 10, 2022CWE-20EPSS 3.45%

Overview

CVE-2021-35247 is a medium-severity vulnerability. It was published on January 10, 2022 and has a CVSS 3.1 base score of 4.3 (MEDIUM). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.

This vulnerability has a CVSS 3.1 base score of 4.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refdocumentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_15-3_release_notes.htmRefwww.solarwinds.com/trust-center/security-advisories/cve-2021-35247Refdocumentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_15-3_release_notes.htmRefwww.solarwinds.com/trust-center/security-advisories/cve-2021-35247CISAwww.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-35247

How CyberStrike helps

Frequently asked questions

What is CVE-2021-35247?

CVE-2021-35247 is a medium-severity vulnerability. It was published on January 10, 2022 and has a CVSS 3.1 base score of 4.3 (MEDIUM). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.

How severe is CVE-2021-35247?

This vulnerability has a CVSS 3.1 base score of 4.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-35247?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-35247?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-35247 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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