Amazon AWS-LC/AWS-LC-FIPS 1.69.0 CRL Distribution Point Validation improper check for certificate revocation

CVSS Meta Temp Score
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CTI Interest Score
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6.4$0-$5k0.00

Summaryinfo

A vulnerability marked as problematic has been reported in Amazon AWS-LC and AWS-LC-FIPS. This issue affects some unknown processing of the component CRL Distribution Point Validation. The manipulation leads to improper check for certificate revocation. This vulnerability is documented as CVE-2026-4428. The attack can be initiated remotely. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Amazon AWS-LC and AWS-LC-FIPS. It has been rated as problematic. This issue affects an unknown code of the component CRL Distribution Point Validation. The manipulation with an unknown input leads to a improper check for certificate revocation vulnerability. Using CWE to declare the problem leads to CWE-299. The product does not check or incorrectly checks the revocation status of a certificate, which may cause it to use a certificate that has been compromised. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

A logic error in CRL distribution point validation in AWS-LC before 1.71.0 causes partitioned CRLs to be incorrectly rejected as out of scope, which allows a revoked certificate to bypass certificate revocation checks. To remediate this issue, users should upgrade to AWS-LC 1.71.0 or AWS-LC-FIPS-3.3.0.

It is possible to read the advisory at aws.amazon.com. The identification of this vulnerability is CVE-2026-4428 since 03/19/2026. The exploitation is known to be difficult. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1557.003 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 303221 (Linux Distros Unpatched Vulnerability : CVE-2026-4428), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.71.0 eliminates this vulnerability. The upgrade is hosted for download at github.com.

The vulnerability is also documented in the vulnerability database at Tenable (303221). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.4

VulDB Base Score: 5.6
VulDB Temp Score: 5.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.4
CNA Vector (AMZN): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Improper check for certificate revocation
CWE: CWE-299 / CWE-298 / CWE-295
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 303221
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-4428

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: AWS-LC/AWS-LC-FIPS 1.71.0

Timelineinfo

03/19/2026 CVE reserved
03/20/2026 +1 days Advisory disclosed
03/20/2026 +0 days VulDB entry created
03/24/2026 +4 days VulDB entry last update

Sourcesinfo

Advisory: aws.amazon.com
Status: Confirmed

CVE: CVE-2026-4428 (🔒)
GCVE (CVE): GCVE-0-2026-4428
GCVE (VulDB): GCVE-100-351971

Entryinfo

Created: 03/20/2026 08:31
Updated: 03/24/2026 15:12
Changes: 03/20/2026 08:31 (76), 03/23/2026 04:21 (2), 03/24/2026 15:12 (1)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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