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CVE-2026-39458Suited to automated attack · CISA

BIG-IP DNS Cache vulnerability

CVSS score

7.5

EPSS probability

%0.5

Risk score

0.0

Published

5 mo ago

OverviewPublic Exploits (0)NewsroomVulnerability Timeline
Official patch verified

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Impact on My Inventory

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Vulnerability description

DayBreach CVE AI Research

CVE-2026-39458 has vendor, distribution, patch and security-source records on file. We can compare them and prepare an explanation linked to the evidence.

When a BIG-IP is configured with DNS caching (Such as a DNS profile with caching enabled, SSL Orchestrator, Advanced WAF DoS protection), undisclosed traffic can cause the Traffic Management Microkernel (TMM) to terminate. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-39458 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

IDVENDORPRODUCTACTION
1f5BIG-IP View
2f5big-ip access policy manager View
3f5big-ip access policy manager View
4f5big-ip advanced firewall manager View
5f5big-ip advanced firewall manager View
6f5big-ip advanced web application firewall View
7f5big-ip advanced web application firewall View
8f5big-ip analytics View
9f5big-ip analytics View
10f5big-ip application acceleration manager View
11f5big-ip application acceleration manager View
12f5big-ip application security manager View
13f5big-ip application security manager View
14f5big-ip application visibility and reporting View
15f5big-ip application visibility and reporting View
16f5big-ip automation toolchain View
17f5big-ip automation toolchain View
18f5big-ip carrier-grade nat View
19f5big-ip carrier-grade nat View
20f5big-ip container ingress services View
21f5big-ip container ingress services View
22f5big-ip ddos hybrid defender View
23f5big-ip ddos hybrid defender View
24f5big-ip domain name system View
25f5big-ip domain name system View
26f5big-ip edge gateway View
27f5big-ip edge gateway View
28f5big-ip fraud protection service View
29f5big-ip fraud protection service View
30f5big-ip global traffic manager View
31f5big-ip global traffic manager View
32f5big-ip link controller View
33f5big-ip link controller View
34f5big-ip local traffic manager View
35f5big-ip local traffic manager View
36f5big-ip policy enforcement manager View
37f5big-ip policy enforcement manager View
38f5big-ip ssl orchestrator View
39f5big-ip ssl orchestrator View
40f5big-ip webaccelerator View
41f5big-ip webaccelerator View
42f5big-ip websafe View
43f5big-ip websafe View
44f5big-ip access policy manager View
45f5big-ip advanced firewall manager View
46f5big-ip advanced web application firewall View
47f5big-ip analytics View
48f5big-ip application acceleration manager View
49f5big-ip application security manager View
50f5big-ip application visibility and reporting View
51f5big-ip automation toolchain View
52f5big-ip carrier-grade nat View
53f5big-ip container ingress services View
54f5big-ip ddos hybrid defender View
55f5big-ip domain name system View
56f5big-ip edge gateway View
57f5big-ip fraud protection service View
58f5big-ip global traffic manager View
59f5big-ip link controller View
60f5big-ip local traffic manager View
61f5big-ip policy enforcement manager View
62f5big-ip ssl orchestrator View
63f5big-ip webaccelerator View
64f5big-ip websafe View
65f5big-ip access policy manager View
66f5big-ip advanced firewall manager View
67f5big-ip advanced web application firewall View
68f5big-ip analytics View
69f5big-ip application acceleration manager View
70f5big-ip application security manager View
71f5big-ip application visibility and reporting View
72f5big-ip automation toolchain View
73f5big-ip carrier-grade nat View
74f5big-ip container ingress services View
75f5big-ip ddos hybrid defender View
76f5big-ip domain name system View
77f5big-ip edge gateway View
78f5big-ip fraud protection service View
79f5big-ip global traffic manager View
80f5big-ip link controller View
81f5big-ip local traffic manager View
82f5big-ip policy enforcement manager View
83f5big-ip ssl orchestrator View
84f5big-ip webaccelerator View
85f5big-ip websafe View
Total affected vendors: 1|Products: 85

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCOREVERSIONSEVERITYVECTORSOURCE
8.7CVSS V40HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:XNVD
8.7CVSS V4_0HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:NCVE CNA
7.5CVSS V31HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HNVD
7.5CVSS V3_1HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HCVE CNA

Patch and Remediation Guide

Solution & Remediation Advisory

Patch verified

2 doğrulanmış yama veya düzeltilmiş sürüm kanıtı bulundu.

cvelist

CNA çözüm referansı

Open source
reference

Yama veya çözüm referansı

Open source
Confirm the affected product and version against the source evidence above.
Restrict access to internet-facing services and apply network segmentation.
Apply the official update named in the evidence only to the matching product and version.
Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-39458 is associated with the following CWEs:

CWE-824: Common Weakness Enumeration Entry CWE-824

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-39458 weaknesses.

CAPEC-66: SQL InjectionCAPEC-126: Path TraversalCAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureAğ üzerinden
PermissionsGerekmiyor
UserGerekmiyor

Official Sources and Advisories

https://my.f5.com/manage/s/article/K000160945patch

CVSS Vector Radar Chart

7.5 / 10
Attack VectorNetworkComplexityLowPrivilegesNoneUser Interact.NoneConfidentialityLowIntegrityNoneAvailabilityHigh

Vulnerability Scoring Details

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone required
User InteractionNone required
Confidentiality (Gizlilik)Low
Integrity (Bütünlük)None
Availability (Erişilebilirlik)High

Yama doğrulandı

2 doğrulanmış yama veya düzeltilmiş sürüm kanıtı bulundu.

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Weakness Type (CWE & CAPEC)

CWE-824

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