What is CVE-2021-33557?

CVE-2021-33557 is a medium-severity vulnerability in Mantisbt, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-06-17.

How severe is CVE-2021-33557?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Is CVE-2021-33557 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Mantisbt

CVE-2021-33557

An XSS issue was discovered in manage_custom_field_edit_page.php in MantisBT before 2.25.2. Unescaped output of the return parameter allows an attacker to inject code into a hidden input field.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.018 (76.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Mantisbt
N/a — versions n/a

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

References

cve@mitre.org (Exploit, x_refsource_MISC, Vendor Advisory)
cve@mitre.org (x_refsource_CONFIRM, Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2021-33557?: CVE-2021-33557 is a medium-severity vulnerability in Mantisbt, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-06-17.
How severe is CVE-2021-33557?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2021-33557 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.