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No exploitation reportedFix available

CVE-2021-42077

No exploitation reported by the sources we read.

  • Published2021-11-08
  • Fixed in2021-09-03
  • WeaknessCWE-89

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

PHP Event Calendar before 2021-09-03 allows SQL injection, as demonstrated by the /server/ajax/user_manager.php username parameter. This can be used to execute SQL statements directly on the database, allowing an adversary in some cases to completely compromise the database system. It can also be used to bypass the login form.

Timeline

dates in UTC
  1. 2021-11-0804:15CVE publishedNVD

Versions per branch

NVD
Kaysongroup php event calendar
BranchAffectedFixed in
2021.x< 2021-09-032021-09-03

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

  1. Update Kaysongroup php event calendar to 2021-09-03

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2021-11-08
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-7jgw-jw8c-v49c

Frequently asked questions

What is CVE-2021-42077?

PHP Event Calendar before 2021-09-03 allows SQL injection, as demonstrated by the /server/ajax/user_manager.php username parameter. This can be used to execute SQL statements directly on the database, allowing an adversary in some cases to completely compromise the database system. It can also be used to bypass the login form.

Is CVE-2021-42077 actively exploited?

Active exploitation of CVE-2021-42077 has not been confirmed. Its EPSS score was 2.5% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-42077?

CVE-2021-42077 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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