CVE-2020-27721
HIGH
7.5
CVSS Score
Published: December 24, 2020 at 02:52 PM UTC
Updated: June 17, 2026 at 03:09 AM UTC
2 products affected across 1 vendorBig IP Global Traffic ManagerBig IP Domain Name System
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Severity
HIGH7.5
Exploit prediction
EPSS 1%
Description
In versions 16.0.0-16.0.0.1, 15.1.0-15.1.1, 14.1.0-14.1.3, 13.1.0-13.1.3.5, 12.1.0-12.1.5.2, and 11.6.1-11.6.5.2, in a BIG-IP DNS / BIG-IP LTM GSLB deployment, under certain circumstances, the BIG-IP DNS system may stop using a BIG-IP LTM virtual server for DNS response.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
11.6.1 ≤ v ≤ 11.6.512.1.0 ≤ v ≤ 12.1.513.1.0 ≤ v ≤ 13.1.314.1.0 ≤ v < 14.1.3.115.0.0 ≤ v < 15.1.216.0.0 ≤ v < 16.0.111.6.1-11.6.5.212.1.0-12.1.5.213.1.0-13.1.3.514.1.0-14.1.315.1.0-15.1.116.0.0-16.0.0.1
Affected range stops below 14.1.3.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 15.1.2, so it looks safe — our inference, not a vendor statement
Affected range stops below 16.0.1, so it looks safe — our inference, not a vendor statement
11.6.1 ≤ v ≤ 11.6.512.1.0 ≤ v ≤ 12.1.513.1.0 ≤ v ≤ 13.1.314.1.0 ≤ v < 14.1.3.115.0.0 ≤ v < 15.1.216.0.0 ≤ v < 16.0.111.6.1-11.6.5.212.1.0-12.1.5.213.1.0-13.1.3.514.1.0-14.1.315.1.0-15.1.116.0.0-16.0.0.1
Affected range stops below 14.1.3.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 15.1.2, so it looks safe — our inference, not a vendor statement
Affected range stops below 16.0.1, so it looks safe — our inference, not a vendor statement
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
References (1)
x_refsource_MISCVendor Advisory
Source: [email protected]
https://support.f5.com/csp/article/K52035247CVSS
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- NONE
- Integrity
- NONE
- Availability
- HIGH
Vector?
Quick Info
StatusMODIFIED
CWE
NVD-CWE-noinfo
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