What’s Vulnerable › Vulnerabilities

CVE-2023-5594: Improper following of a certificate's chain of trust in ESET security products

• Severity: high (CVSS 8.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-12-21 · updated 2026-06-17
• Weakness: CWE-295

Description

Improper validation of the server’s certificate chain in secure traffic scanning feature considered intermediate certificate signed using the MD5 or SHA1 algorithm as trusted.

Affected products

• ESET Endpoint Antivirus: from 10.0
• ESET Endpoint Security: all versions
• ESET File Security: all versions
• ESET Internet Security: all versions
• ESET Mail Security: all versions
• ESET Nod32 Antivirus: all versions
• ESET Security: all versions
• ESET Server Security: from 10.1
• ESET Smart Security: all versions

References

• https://support.eset.com/en/ca8562-eset-customer-advisory-improper-following-of-a-certificates-chain-of-trust-in-eset-security-products-fixed
• https://support.eset.com/en/ca8562-eset-customer-advisory-improper-following-of-a-certificates-chain-of-trust-in-eset-security-products-fixed

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