Predictive Vulnerability Intelligence.

Product

  • Product
  • Pricing
  • Documentation

Company

  • About
  • Partnerships
  • Blog
  • Support

Legal

  • Terms
  • Privacy
  • Data Licensing

© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2015-4638

15
FAUCET Score

CVE-2015-4638 describes a denial-of-service vulnerability in the FastL4 virtual server of various F5 BIG-IP products, including LTM, AAM, and AFM, across several versions. A remote attacker can exploit this flaw by sending a fragmented packet, causing the Traffic Management Microkernel to restart. This vulnerability has a CVSS score of 5.0, indicating a medium severity with a network attack vector and low attack complexity, leading to a partial availability impact. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
11.3.0CPE matchmatch criteria
cpe:2.3:a:f5:big-ip_advanced_firewall_manager:11.3.0:*:*:*:*:*:*:*
11.4.0CPE matchmatch criteria
cpe:2.3:a:f5:big-ip_advanced_firewall_manager:11.4.0:*:*:*:*:*:*:*
11.4.1CPE matchmatch criteria
cpe:2.3:a:f5:big-ip_advanced_firewall_manager:11.4.1:*:*:*:*:*:*:*
11.5.0CPE matchmatch criteria
cpe:2.3:a:f5:big-ip_advanced_firewall_manager:11.5.0:*:*:*:*:*:*:*
11.5.1CPE matchmatch criteria
cpe:2.3:a:f5:big-ip_advanced_firewall_manager:11.5.1:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.0MEDIUM

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

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
1.74%
Probability of exploitation in next 30 days
EPSS Percentile
75.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0174 is in the 61st percentile among its peer group of 23,725 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 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 / kb/en-us/solutions/public/17000/100/sol17155.html
Vendor Advisory
securitytracker.com / id/1033578