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CVE Record

CVE-2018-0231: A vulnerability in the Transport Layer Security (TLS) library of Cisco Adaptive Security Appliance (ASA) So...

A vulnerability in the Transport Layer Security (TLS) library of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to trigger a reload of the affected device, resulting in a denial of service (DoS) condition. The vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by sending a malicious TLS message to an interface enabled for Secure Layer Socket (SSL) services on an affected device. Messages using SSL Version 3 (SSLv3) or SSL Version 2 (SSLv2) cannot be be used to exploit this vulnerability. An exploit could allow the attacker to cause a buffer underflow, triggering a crash on an affected device. This vulnerability affects Cisco ASA Software and Cisco FTD Software that is running on the following Cisco products: Adaptive Security Virtual Appliance (ASAv), Firepower Threat Defense Virtual (FTDv), Firepower 2100 Series Security Appliance. Cisco Bug IDs: CSCve18902, CSCve34335, CSCve38446.

UnknownCVSS not scoredNot KEV-listedUpdated
Glexia's TakeAutomated analysis

Security readout for executives and security teams

CVE-2018-0231 can let a remote, unauthenticated attacker crash and reload certain Cisco ASA and FTD security appliances through malformed TLS traffic. The business impact is service interruption at the network edge, especially where SSL services are reachable from untrusted networks. Exposure is most likely on affected Cisco ASA or FTD devices with SSL services enabled on interfaces reachable by attackers, including internet-facing VPN or management-adjacent surfaces. Treat as high priority for edge firewalls and remote-access infrastructure because exploitation can interrupt security appliance availability without authentication. Urgency depends on exposed SSL services and business reliance on the affected devices. Mitigation focus: Review Cisco advisory cisco-sa-20180418-asa3 for affected and fixed releases.; Prioritize remediation for internet-facing SSL-enabled ASA or FTD interfaces.; Limit SSL service exposure to trusted networks where operationally possible..

Prepared

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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CVE-2018-0231 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
3Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/aCisco Adaptive Security ApplianceCisco Adaptive Security ApplianceListed
Weakness

CWE details

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CWE-20 · source CWE mapping

Improper Input Validation

Improper Input Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.