What’s Vulnerable › Vulnerabilities

CVE-2017-12373

• Severity: medium (CVSS 5.9 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 12.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2017-12-15 · updated 2026-06-17
• Weakness: CWE-200

Description

A vulnerability in the TLS protocol implementation of legacy Cisco ASA 5500 Series (ASA 5505, 5510, 5520, 5540, and 5550) devices could allow an unauthenticated, remote attacker to access sensitive information, aka a Return of Bleichenbacher's Oracle Threat (ROBOT) attack. An attacker could iteratively query a server running a vulnerable TLS stack implementation to perform cryptanalytic operations that may allow decryption of previously captured TLS sessions. Cisco Bug IDs: CSCvg97652.

Affected products

• Cisco Adaptive Security Appliance 5505 Firmware: all versions
• Cisco Adaptive Security Appliance 5510 Firmware: all versions
• Cisco Adaptive Security Appliance 5520 Firmware: all versions
• Cisco Adaptive Security Appliance 5540 Firmware: all versions
• Cisco Adaptive Security Appliance 5550 Firmware: all versions

References

• http://www.securityfocus.com/bid/102170
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20171212-bleichenbacher
• http://www.securityfocus.com/bid/102170
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20171212-bleichenbacher

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