Is CVE-2021-43808 in the CISA KEV catalog?

No. CVE-2021-43808 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-43808?

CVE-2021-43808 has a CVSS v3 base score of 5.3 (MEDIUM).

What is the EPSS score for CVE-2021-43808?

CVE-2021-43808 has an EPSS score of 0.80% (52th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-43808?

Upgrade php-laravel-framework on debian 11 to 6.20.14+dfsg-2+deb11u1 or later.

CVE & CISA-KEV Catalog

CVE-2021-43808

MEDIUM

5.3

CVSS v3

NVD

Description

Laravel is a web application framework. Laravel prior to versions 8.75.0, 7.30.6, and 6.20.42 contain a possible cross-site scripting (XSS) vulnerability in the Blade templating engine. A broken HTML element may be clicked and the user taken to another location in their browser due to XSS. This is due to the user being able to guess the parent placeholder SHA-1 hash by trying common names of sections. If the parent template contains an exploitable HTML structure an XSS vulnerability can be exposed. This vulnerability has been patched in versions 8.75.0, 7.30.6, and 6.20.42 by determining the parent placeholder at runtime and using a random hash that is unique to each request.

CWE-79Cross-Site Scripting (XSS)CWE-327

How to fix

Remediation Available

php-laravel-frameworkDebian

Fixed in:6.20.14+dfsg-2+deb11u1CVE-2021-43808

Fixed in:6.20.14+dfsg-3CVE-2021-43808

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 ComplexityHigh

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

0.80%probability of exploitation in 30 days

52ndpercentile

Moderate risk: more likely to be exploited than 52% of all known CVEs.

References

Patch4

Exploit1

github.com

Third-Party Advisory3

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-2021-43808

Markdown

[![CVE-2021-43808](https://tridentstack.com/cve/badge/CVE-2021-43808.svg)](https://tridentstack.com/cve/CVE-2021-43808)

HTML

<a href="https://tridentstack.com/cve/CVE-2021-43808"><img src="https://tridentstack.com/cve/badge/CVE-2021-43808.svg" alt="CVE-2021-43808"></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.