CVE-2021-27963

HIGHNVD 8.28.2—

8.2

SonLogger before 6.4.1 is affected by user creation with any user permissions profile (e.g., SuperAdmin). An anonymous user can send a POST request to /User/saveUser without any authentication or session header.

CVSS v3: 8.2
EG Score: 8.2(medium)
EPSS: 87.1%
KEV: Not listed

Published

March 5, 2021

Last Modified

November 21, 2024

References (4)

cve@mitrehttps://github.com/erberkan/SonLogger-vulns
cve@mitrehttps://www.sonlogger.com/releasenotes
af854a3a-2127-422b-91ae-364da2661108https://github.com/erberkan/SonLogger-vulns
af854a3a-2127-422b-91ae-364da2661108https://www.sonlogger.com/releasenotes

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 11× in last 7d / 17× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 20:09 UTCEG score recompute
2026-05-26 20:09 UTCGHSA enrichment
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch

Frequently asked(5)

What is CVE-2021-27963?

CVE-2021-27963 is a high vulnerability published on March 5, 2021. SonLogger before 6.4.1 is affected by user creation with any user permissions profile (e.g., SuperAdmin). An anonymous user can send a POST request to /User/saveUser without any authentication or session header.

When was CVE-2021-27963 disclosed?

CVE-2021-27963 was first published in the National Vulnerability Database on March 5, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-27963 actively exploited?

CVE-2021-27963 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 87.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-27963?

CVE-2021-27963 has a CVSS v3 base score of 8.2 (NVD).

How do I remediate CVE-2021-27963?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-27963, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2021-27963

📅 Published

🔄 Last Modified

🔗 References (4)

Weakness Classification(2)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-27963?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (4)

Frequently asked(5)

Related CVEs(same CWE)