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CVE-2021-27963

25
FAUCET Score

CVE-2021-27963 is an authentication bypass vulnerability affecting SonLogger versions prior to 6.4.1, allowing an unauthenticated attacker to create new user accounts with arbitrary permissions, including SuperAdmin. This critical flaw has a CVSS score of 8.2 (High) due to its network-based attack vector, low attack complexity, and high impact on integrity. While the vulnerability is not listed in CISA's KEV catalog and lacks public exploit code or significant community discussion, its ease of exploitation and potential for complete system compromise warrant immediate patching.

Impacted Technologies

VendorProductVersion(s)CPE
< 6.4.1CPE matchmatch criteria
cpe:2.3:a:sfcyazilim:sonlogger:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.2HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
4.2
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.45%
Probability of exploitation in next 30 days
EPSS Percentile
82.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0245 is in the 69th percentile among its peer group of 51,553 CVEs.

Social Chatter

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

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

github.com / erberkan/SonLogger-vulns
ExploitThird Party Advisory
sonlogger.com / releasenotes
Release NotesVendor Advisory