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CVE-2018-5508

20
FAUCET Score

CVE-2018-5508 describes a denial-of-service vulnerability affecting specific versions of F5 BIG-IP PEM. Under certain conditions, processing compressed data through a Virtual Server with an associated PEM profile using content insertion can cause the Traffic Management Microkernel (TMM) to crash. This vulnerability has a CVSS score of 5.9 (MEDIUM), indicating a network-based attack with high attack complexity and a high impact on availability. There is no known public exploit code, Metasploit modules, or Nuclei templates available, and it is not listed in the CISA KEV catalog. Community discussion and media coverage for this CVE are minimal.

Impacted Technologies

VendorProductVersion(s)CPE
>= 11.5.1, <= 11.5.5CPE matchmatch criteria
cpe:2.3:a:f5:big-ip_policy_enforcement_manager:*:*:*:*:*:*:*:*
>= 11.6.0, <= 11.6.2CPE matchmatch criteria
cpe:2.3:a:f5:big-ip_policy_enforcement_manager:*:*:*:*:*:*:*:*
>= 12.0.0, <= 12.1.3CPE matchmatch criteria
cpe:2.3:a:f5:big-ip_policy_enforcement_manager:*:*:*:*:*:*:*:*
11.2.1CPE matchmatch criteria
cpe:2.3:a:f5:big-ip_policy_enforcement_manager:11.2.1:*:*:*:*:*:*:*
13.0.0CPE matchmatch criteria
cpe:2.3:a:f5:big-ip_policy_enforcement_manager:13.0.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

5.9MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
2.2
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.86%
Probability of exploitation in next 30 days
EPSS Percentile
54.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0086 is in the 12th percentile among its peer group of 19,958 CVEs.

Social Chatter

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

Media Mentions

No media coverage found for this CVE.

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

Remediation

Remediation records are not available for this CVE.

References

support.f5.com / csp/article/K10329515
Vendor Advisory