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CVE-2018-0231

28
FAUCET Score

CVE-2018-0231 describes a denial-of-service vulnerability in the TLS library of Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software, affecting various Cisco products including ASAv and FTDv. This high-severity vulnerability (CVSS 8.6) allows an unauthenticated, remote attacker to trigger a device reload by sending a malicious TLS message to an SSL-enabled interface, leading to a buffer underflow and system crash. While the risk score is 66/100, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
9.8\(1\)CPE matchmatch criteria
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8\(1\):*:*:*:*:*:*:*
98.1\(1.154\)CPE matchmatch criteria
cpe:2.3:o:cisco:adaptive_security_appliance_software:98.1\(1.154\):*:*:*:*:*:*:*
>= 6.0, < 6.1.0.6CPE matchmatch criteria
cpe:2.3:a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:*
>= 6.2.1, < 6.2.2.1CPE matchmatch criteria
cpe:2.3:a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

8.6HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
4.0
CvssVersion
3.0

Exploit Intelligence

EPSS Score
4.60%
Probability of exploitation in next 30 days
EPSS Percentile
90.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0460 is in the 84th percentile among its peer group of 51,551 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

ciscovendor investigatingvia nvd_reference
View patch

References

ics-cert.us-cert.gov / advisories/ICSA-18-184-01
Third Party AdvisoryUS Government Resource
tools.cisco.com / security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-asa3
Vendor Advisory
securitytracker.com / id/1040725
Third Party AdvisoryVDB Entry