Is CVE-2021-25633 in the CISA KEV catalog?

No. CVE-2021-25633 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-25633?

CVE-2021-25633 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2021-25633?

CVE-2021-25633 has an EPSS score of 0.71% (49th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-25633?

Upgrade libreoffice on debian 11 to 1:7.0.4-4+deb11u1 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2021-25633

HIGH

7.5

CVSS v3

NVD

Description

LibreOffice supports digital signatures of ODF documents and macros within documents, presenting visual aids that no alteration of the document occurred since the last signing and that the signature is valid. An Improper Certificate Validation vulnerability in LibreOffice allowed an attacker to create a digitally signed ODF document, by manipulating the documentsignatures.xml or macrosignatures.xml stream within the document to combine multiple certificate data, which when opened caused LibreOffice to display a validly signed indicator but whose content was unrelated to the signature shown. This issue affects: The Document Foundation LibreOffice 7-0 versions prior to 7.0.6; 7-1 versions prior to 7.1.2.

CWE-295Improper Certificate Validation

How to fix

Remediation Available

libreofficeDebian

Fixed in:1:7.0.4-4+deb11u1CVE-2021-25633

Fixed in:1:7.2.0-2CVE-2021-25633

libreofficeUbuntu

Fixed in:1:6.4.7-0ubuntu0.20.04.2USN-5153-1

libreoffice-coreUbuntu

Fixed in:1:6.4.7-0ubuntu0.20.04.2USN-5153-1

LibreOfficeWindows application

Affected:7.0.0 7.0.6Fixed in:7.0.6The Document Foundation

Affected:7.1.0 7.1.2Fixed in:7.1.2The Document Foundation

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

ConfidentialityNone

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

0.71%probability of exploitation in 30 days

49thpercentile

Moderate risk: more likely to be exploited than 49% of all known CVEs.

References

Vendor Advisory1

libreoffice.org

Third-Party Advisory1

debian.org

Related Vulnerabilities

Other CWE-295 (Improper Certificate Validation) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2015-4000	Low	3.7	100%	-	Fix
CVE-2020-0601	High	8.1	89%	KEV	Fix
CVE-2009-3555	Critical	9.8	87%	-	Fix
CVE-2022-26923	High	8.8	83%	KEV	Fix
CVE-2023-27823	Critical	9.8	53%	-	-
CVE-2022-42979	High	8.8	24%	-	-

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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.