CVE-2017-12373

Name: CVE-2017-12373
Creator: NVD / NIST
Published: 2017-12-15T20:29:00.207+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 12.80%

Last modified Jun 17, 2026

CVE-2017-12373 is a vulnerability of currently unknown severity. 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. EPSS estimates a 12.80% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability

12.80%

95.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
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/102170Third Party Advisory, VDB Entry
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20171212-bleichenbacherIssue Tracking, Mitigation, Vendor Advisory
http://www.securityfocus.com/bid/102170Third Party Advisory, VDB Entry
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20171212-bleichenbacherIssue Tracking, Mitigation, Vendor Advisory

Timeline

Published: Dec 15, 2017
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2017-12373?

How severe is CVE-2017-12373?

Severity scoring for CVE-2017-12373 is pending analysis. The EPSS model estimates a 12.80% probability of exploitation in the next 30 days.

How do I fix CVE-2017-12373?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2017-12373?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST