Is CVE-2021-3313 in the CISA KEV catalog?

No. CVE-2021-3313 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-3313?

CVE-2021-3313 has a CVSS v3 base score of 5.4 (MEDIUM).

What is the EPSS score for CVE-2021-3313?

CVE-2021-3313 has an EPSS score of 0.97% (58th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-3313?

Upgrade plone to 5.2.4 or later.

CVE & CISA-KEV Catalog

CVE-2021-3313

MEDIUM

5.4

CVSS v3

NVD

Description

Plone CMS until version 5.2.4 has a stored Cross-Site Scripting (XSS) vulnerability in the user fullname property and the file upload functionality. The user's input data is not properly encoded when being echoed back to the user. This data can be interpreted as executable code by the browser and allows an attacker to execute JavaScript in the context of the victim's browser if the victim opens a vulnerable page containing an XSS payload.

CWE-79Cross-Site Scripting (XSS)

How to fix

Remediation Available

ploneNVD

Affected:< 5.2.4Fixed in:5.2.4CVE-2021-3313derived 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 RequiredLow

User InteractionRequired

ScopeChanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

0.97%probability of exploitation in 30 days

58thpercentile

Moderate risk: more likely to be exploited than 58% of all known CVEs.

References

Exploit1

compass-security.com

Vendor Advisory2

Third-Party Advisory1

openwall.com

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

Embed a live status badge for CVE-2021-3313

Markdown

[![CVE-2021-3313](https://tridentstack.com/cve/badge/CVE-2021-3313.svg)](https://tridentstack.com/cve/CVE-2021-3313)

HTML

<a href="https://tridentstack.com/cve/CVE-2021-3313"><img src="https://tridentstack.com/cve/badge/CVE-2021-3313.svg" alt="CVE-2021-3313"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

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.