CVE-2017-12373

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Summary

CVECVE-2017-12373
StatePUBLISHED
Assignercisco
Source PriorityCVE Program / NVD first with legacy fallback
Published2017-12-15 20:29:00 UTC
Updated2025-04-20 01:37:25 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v3.0 5.9 MEDIUM from [email protected]

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

EPSS: 0.669440000 probability, percentile 0.985690000 (date 2026-05-18)

Problem Types: CWE-200 | CWE-203 | CWE-200 CWE-200

VersionSourceTypeScoreSeverityVector
3.0[email protected]Primary5.9MEDIUMCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
2.0[email protected]Primary4.3AV:N/AC:M/Au:N/C:P/I:N/A:N

CVSS v3.0 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

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

CVSS v2.0 Breakdown

Access Vector
Network
Access Complexity
Medium
Authentication
None
Confidentiality
Partial
Integrity
None
Availability
None

AV:N/AC:M/Au:N/C:P/I:N/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Hardware Cisco Adaptive Security Appliance 5505 - All All All
Operating System Cisco Adaptive Security Appliance 5505 Firmware - All All All
Hardware Cisco Adaptive Security Appliance 5510 - All All All
Operating System Cisco Adaptive Security Appliance 5510 Firmware - All All All
Hardware Cisco Adaptive Security Appliance 5520 - All All All
Operating System Cisco Adaptive Security Appliance 5520 Firmware - All All All
Hardware Cisco Adaptive Security Appliance 5540 - All All All
Operating System Cisco Adaptive Security Appliance 5540 Firmware - All All All
Hardware Cisco Adaptive Security Appliance 5550 - All All All
Operating System Cisco Adaptive Security Appliance 5550 Firmware - All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na Cisco Legacy ASA 5500 Products TLS Protocol Implementation affected Cisco legacy ASA 5500 products TLS protocol implementation Not specified

References

ReferenceSourceLinkTags
Multiple Cisco Products Multiple Information Disclosure Vulnerabilities af854a3a-2127-422b-91ae-364da2661108 www.securityfocus.com Third Party Advisory, VDB Entry
Bleichenbacher Attack on TLS Affecting Cisco Products: December 2017 af854a3a-2127-422b-91ae-364da2661108 tools.cisco.com Issue Tracking, Mitigation, Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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