Is CVE-2026-27221 in the CISA KEV catalog?

No. CVE-2026-27221 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-27221?

CVE-2026-27221 has a CVSS v3 base score of 5.5 (MEDIUM).

What is the EPSS score for CVE-2026-27221?

CVE-2026-27221 has an EPSS score of 0.10% (1th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-27221?

Upgrade Adobe Acrobat 2020 to 24.001.30356 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2026-27221

MEDIUM

5.5

CVSS v3

NVD

Description

Acrobat Reader versions 24.001.30307, 24.001.30308, 25.001.21265 and earlier are affected by an Improper Certificate Validation vulnerability that could result in a Security feature bypass. An attacker could leverage this vulnerability to spoof the identity of a signer. Exploitation of this issue requires user interaction.

CWE-295Improper Certificate Validation

How to fix

Remediation Available

Adobe Acrobat 2020Windows application

Affected:24.001.20604 24.001.30356Fixed in:24.001.30356

Adobe Acrobat ProWindows application

Affected:24.001.20604 24.001.30356Fixed in:24.001.30356

Adobe Acrobat Reader (32-bit)Windows application

Affected:25.001.21288Fixed in:25.001.21288

Adobe Acrobat Reader (64-bit)Windows application

Affected:25.001.21288Fixed in:25.001.21288

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 VectorLocal

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

0.10%probability of exploitation in 30 days

1stpercentile

Low risk: more likely to be exploited than 1% of all known CVEs.

References

Vendor Advisory1

helpx.adobe.com

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 2026-03-11.