Is CVE-2021-3838 in the CISA KEV catalog?

No. CVE-2021-3838 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-3838?

CVE-2021-3838 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2021-3838?

CVE-2021-3838 has an EPSS score of 1.43% (70th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-3838?

Upgrade php-dompdf on debian 11 to 0.6.2+dfsg-3.1+deb11u1 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2021-3838

CRITICAL

9.8

CVSS v3

NVD

Description

DomPDF before version 2.0.0 is vulnerable to PHAR deserialization due to a lack of checking on the protocol before passing it into the file_get_contents() function. An attacker who can upload files of any type to the server can pass in the phar:// protocol to unserialize the uploaded file and instantiate arbitrary PHP objects. This can lead to remote code execution, especially when DOMPdf is used with frameworks with documented POP chains like Laravel or vulnerable developer code.

CWE-502Deserialization of Untrusted Data

How to fix

Remediation Available

php-dompdfDebian

Fixed in:0.6.2+dfsg-3.1+deb11u1CVE-2021-3838

Fixed in:2.0.2+dfsg-1CVE-2021-3838

php-dompdfUbuntu

Fixed in:0.6.1+dfsg-2ubuntu1+esm1USN-6277-1

Fixed in:0.6.2+dfsg-3ubuntu0.18.04.1~esm1USN-6277-1

Fixed in:0.6.2+dfsg-3ubuntu0.20.04.1USN-6277-1

Fixed in:0.6.2+dfsg-3.1ubuntu0.1USN-6277-2

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 InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

1.43%probability of exploitation in 30 days

70thpercentile

Moderate risk: more likely to be exploited than 70% of all known CVEs.

References

Patch2

Related Vulnerabilities

Other CWE-502 (Deserialization of Untrusted Data) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-0669	High	7.2	100%	KEV + Ransom	Fix
CVE-2021-44228	Critical	10.0	100%	KEV + Ransom	Fix
CVE-2021-35464	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2023-29300	Critical	9.8	100%	KEV + Ransom	-
CVE-2025-53770	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2022-47986	Critical	9.8	100%	KEV + Ransom	-

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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 2024-11-19.