What is CVE-2017-12373?

CVE-2017-12373 is a medium-severity vulnerability in Cisco Adaptive Security Appliance 5505, classified under Information Disclosure. CVSS score: 5.9/10. Published 2017-12-15.

How severe is CVE-2017-12373?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Is CVE-2017-12373 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Information disclosure in Cisco Adaptive Security Appliance 5505

CVE-2017-12373

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.

Vulnerability class: Information Disclosure

Published 2017-12-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.128 (96.2th percentile), scored 2026-09-30.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 96th percentile — 96.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.128 · newest: 0.128 · change: 0.000

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

rapid7/metasploit-framework

References

www.securityfocus.com/bid/102170 (VDB Entry, Third Party Advisory, vdb-entry)
tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20171212… (Mitigation, Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2017-12373?: CVE-2017-12373 is a medium-severity vulnerability in Cisco Adaptive Security Appliance 5505, classified under Information Disclosure. CVSS score: 5.9/10. Published 2017-12-15.
How severe is CVE-2017-12373?: Medium severity. CVSS v3 base score is 5.9 out of 10.
Is CVE-2017-12373 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.