Is CVE-2021-33557 in the CISA KEV catalog?

No. CVE-2021-33557 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-33557?

CVE-2021-33557 has a CVSS v3 base score of 6.1 (MEDIUM).

What is the EPSS score for CVE-2021-33557?

CVE-2021-33557 has an EPSS score of 1.83% (76th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-33557?

Upgrade mantisbt to 2.25.2 or later.

CVE & CISA-KEV Catalog

CVE-2021-33557

MEDIUMEPSS 76th pctl

6.1

CVSS v3

NVD

Description

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.

CWE-79Cross-Site Scripting (XSS)

How to fix

Remediation Available

mantisbtNVD

Affected:< 2.25.2Fixed in:2.25.2CVE-2021-33557derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeChanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

1.83%probability of exploitation in 30 days

76thpercentile

Elevated risk: more likely to be exploited than 76% of all known CVEs.

References

Exploit1

mantisbt.org

Vendor Advisory1

mantisbt.org

Related Vulnerabilities

Other CWE-79 (Cross-Site Scripting (XSS)) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-11022	Medium	6.9	99%	-	Fix
CVE-2019-3929	Critical	9.8	99%	KEV	Fix
CVE-2020-9496	Medium	6.1	99%	-	-
CVE-2023-28341	Medium	6.1	99%	-	Fix
CVE-2018-12998	Medium	6.1	98%	-	-
CVE-2025-4123	High	7.6	98%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.