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CVE-2018-15372

25
FAUCET Score

CVE-2018-15372 is a high-severity vulnerability affecting Cisco IOS XE Software, specifically within the MACsec Key Agreement (MKA) using EAP-TLS functionality. An unauthenticated, adjacent attacker can bypass authentication and gain network access if a Layer 3 interface is configured for MACsec MKA with EAP-TLS in access-session closed mode. The vulnerability has a CVSS score of 8.1 (HIGH), indicating a low attack complexity and high impact on confidentiality and integrity. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
16.8.1CPE matchmatch criteria
cpe:2.3:o:cisco:ios_xe:16.8.1:*:*:*:*:*:*:*
16.9.1CPE matchmatch criteria
cpe:2.3:o:cisco:ios_xe:16.9.1:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

8.1HIGH

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

Attack Vector
ADJACENT_NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
5.2
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.75%
Probability of exploitation in next 30 days
EPSS Percentile
51.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0075 is in the 57th percentile among its peer group of 1,875 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.2 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

ciscovendor investigatingvia nvd_reference
View patch

References

tools.cisco.com / security/center/content/CiscoSecurityAdvisory/cisco-sa-20180926-macsec
Vendor Advisory
securityfocus.com / bid/105416
Third Party AdvisoryVDB Entry