CVE-2021-35247 kev in the critical feed json
Improper Input Validation Vulnerability in Serv-U
published 2022-01-07 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-21890
- cvss
- 4.3
- version 3.1, CNA
- cisa kev
- Exploited
- added 2022-01-21
- epss
- 3.6%
- EPSS 3.6% chance of exploitation in 30 days, percentile 89%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
cisa required action Apply updates per vendor instructions.
- SolarWinds Serv-U 15.3
Timeline
- Published
- Added to CISA KEV
- CISA patch deadline
- CISA SSVC: exploitation active
Known exploited
- Added
- 4 y ago
- Patch by
- 2022-02-04 (4 y ago)
- Ransomware
- Not known
- Required action
- Apply updates per vendor instructions.
- Vendor, product
- SolarWinds, Serv-U
- CISA name
- SolarWinds Serv-U Improper Input Validation Vulnerability
CISA SSVC
- Exploitation
- Active, exploited in the wild
- Automatable
- no
- Technical impact
- partial
- Assessed
- 21 mo ago
Exploit prediction
3.64% chance of exploitation in the next 30 days, higher than 89% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N |
| NVD | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:N/I:P/A:N |
Affected products
- SolarWinds Serv-U
Classification
- Weakness
-
- CWE-20 Improper Input Validation
References
-
solarwinds.com
/trust-center/security-advisories/cve-2021-35247
broken-link, vendor-advisory
-
documentation.solarwinds.com
/en/success_center/servu/content/release_notes/servu_15-3_release_notes.htm
release-notes, vendor-advisory
-
cisa.gov
/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-35247
government-resource, us-government-resource
Sources
- CVE List CVE-2021-35247
- NVD CVE-2021-35247
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.