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Vulnerability record · CVE-2017-12373 · published 15 December 2017

CVE-2017-12373: Cisco adaptive security appliance 5505 firmware information exposure vulnerability

Cisco · Adaptive Security Appliance 5505 Firmware

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.

5.9 CVSS 3.0 Medium EPSS 13% · top 3.8% CWE-200 · Information exposureCWE-203 · Observable discrepancy
5.9CVSS 3.0 base score, v2 4.3
13%EPSS exploitation probability, 30 days
NoNot in CISA KEV
5Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

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.

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

5 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.securityfocus.com/bid/102170 Third Party AdvisoryVDB Entry
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20171212-bleichenbacher Issue TrackingMitigationVendor Advisory
http://www.securityfocus.com/bid/102170 Third Party AdvisoryVDB Entry
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20171212-bleichenbacher Issue TrackingMitigationVendor Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2017-12373), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.