Known exploited vulnerability
CVE-2021-35247
The short answer
CVE-2021-35247 affects SolarWinds Serv-U and is rated medium (CVSS 5.3). CISA added it to the Known Exploited Vulnerabilities catalog on 2022-01-21: attackers are using it, so patch it first.
What it is
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.
Weakness: CWE-20.
Severity
5.3 medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Exploited (CISA KEV)
Yes, since Jan 21, 2022
Federal due date Feb 4, 2022
EPSS, next 30 days
3.6%
Higher than 90% of scored CVEs
How it can be exploited
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- Low
- Availability impact
- None
What CISA says to do
Apply updates per vendor instructions.
Affected products
Serv-U. NVD's record lists the exact affected versions.
References
- documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_15-3_release_notes.htm Release NotesVendor Advisory
- www.solarwinds.com/trust-center/security-advisories/cve-2021-35247 Broken LinkVendor Advisory
- documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_15-3_release_notes.htm Release NotesVendor Advisory
- www.solarwinds.com/trust-center/security-advisories/cve-2021-35247 Broken LinkVendor Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-35247 US Government Resource
Questions
Is CVE-2021-35247 being exploited?
Yes. CISA added CVE-2021-35247 to its Known Exploited Vulnerabilities catalog on 2022-01-21, with a federal remediation due date of 2022-02-04.
How do I fix CVE-2021-35247?
CISA's required action: Apply updates per vendor instructions.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.
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