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CVE-2021-35247

57
FAUCET Score

CVE-2021-35247 is a medium-severity vulnerability affecting SolarWinds Serv-U, where insufficient input sanitization on the web login screen for LDAP authentication could allow improper characters. While LDAP servers typically ignored these characters, SolarWinds has released an update to perform additional validation. The vulnerability has a CVSS score of 5.3 (MEDIUM) with a network attack vector and low attack complexity, potentially leading to limited integrity impact. This CVE is actively exploited, listed in CISA's KEV catalog, and has garnered significant community discussion and media coverage, despite no public exploit code being available.

Impacted Technologies

VendorProductVersion(s)CPE
< 15.3CPE matchmatch criteria
cpe:2.3:a:solarwinds:serv-u:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

4.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
3.42%
Probability of exploitation in next 30 days
EPSS Percentile
87.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
Added to KEV · Jan 21, 2022
This CVE's current EPSS score of 0.0342 is in the 83rd percentile among its peer group of 23,705 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

cisa.gov / known-exploited-vulnerabilities-catalog
US Government Resource
documentation.solarwinds.com / en/success_center/servu/content/release_notes/servu_15-3_release_notes.htm
Release NotesVendor Advisory
solarwinds.com / trust-center/security-advisories/cve-2021-35247
Broken LinkVendor Advisory