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CVE-2021-4259

30
FAUCET Score

CVE-2021-4259 is a critical vulnerability in phpRedisAdmin versions up to 1.16.1, specifically affecting the authHttpDigest function in includes/login.inc.php due to an incorrect string comparison operator. This flaw allows for unauthenticated remote attackers to achieve full compromise of confidentiality, integrity, and availability, as indicated by its CVSS score of 9.8. While no public exploit intelligence (Metasploit, Nuclei, ExploitDB) or active exploitation has been observed, and community discussion is minimal, immediate upgrade to version 1.16.2 is strongly recommended to mitigate this high-risk vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.16.2CPE matchmatch criteria
cpe:2.3:a:phpredisadmin_project:phpredisadmin:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.0MEDIUM

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

Attack Vector
ADJACENT_NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
LOW
Exploitability Score
1.6
Impact Score
3.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.78%
Probability of exploitation in next 30 days
EPSS Percentile
52.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0078 is in the 35th percentile among its peer group of 36,835 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

References

github.com / erikdubbelboer/phpRedisAdmin/commit/31aa7661e6db6f4dffbf9a635817832a0a11c7d9
PatchThird Party Advisory
github.com / erikdubbelboer/phpRedisAdmin/releases/tag/v1.16.2
Release NotesThird Party Advisory
vuldb.com
Permissions RequiredThird Party AdvisoryVDB Entry