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CVE-2020-5947

MEDIUMCVSS 4.3/10EPSS 0.69%

Last modified

CVE-2020-5947 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. In versions 16.0.0-16.0.0.1 and 15.1.0-15.1.1, on specific BIG-IP platforms, attackers may be able to obtain TCP sequence numbers from the BIG-IP system that can be reused in future connections with the same source and destination port and IP numbers. Only these platforms are affected: BIG-IP 2000 series (C112), BIG-IP 4000 series (C113), BIG-IP i2000 series (C117), BIG-IP i4000 series (C115), BIG-IP Virtual Edition (VE).. EPSS estimates a 0.69% chance of exploitation in the next 30 days.

Description

In versions 16.0.0-16.0.0.1 and 15.1.0-15.1.1, on specific BIG-IP platforms, attackers may be able to obtain TCP sequence numbers from the BIG-IP system that can be reused in future connections with the same source and destination port and IP numbers. Only these platforms are affected: BIG-IP 2000 series (C112), BIG-IP 4000 series (C113), BIG-IP i2000 series (C117), BIG-IP i4000 series (C115), BIG-IP Virtual Edition (VE).

Metrics

CVSS 3.1
4.3/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

EPSS Probability
0.69%

48.0th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

VendorProductVersions
F5Big-Ip Access Policy Manager>= 15.0.0, < 15.1.2
F5Big-Ip Access Policy Manager>= 16.0.0, < 16.0.1
F5Big-Ip Advanced Firewall Manager>= 15.0.0, < 15.1.2
F5Big-Ip Advanced Firewall Manager>= 16.0.0, < 16.0.1
F5Big-Ip Advanced Web Application Firewall>= 15.0.0, < 15.1.2
F5Big-Ip Advanced Web Application Firewall>= 16.0.0, < 16.0.1
F5Big-Ip Analytics>= 15.0.0, < 15.1.2
F5Big-Ip Analytics>= 16.0.0, < 16.0.1
F5Big-Ip Application Acceleration Manager>= 15.0.0, < 15.1.2
F5Big-Ip Application Acceleration Manager>= 16.0.0, < 16.0.1
F5Big-Ip Application Security Manager>= 15.0.0, < 15.1.2
F5Big-Ip Application Security Manager>= 16.0.0, < 16.0.1
F5Big-Ip Ddos Hybrid Defender>= 15.0.0, < 15.1.2
F5Big-Ip Ddos Hybrid Defender>= 16.0.0, < 16.0.1
F5Big-Ip Domain Name System>= 15.0.0, < 15.1.2
F5Big-Ip Domain Name System>= 16.0.0, < 16.0.1
F5Big-Ip Fraud Protection Service>= 15.0.0, < 15.1.2
F5Big-Ip Fraud Protection Service>= 16.0.0, < 16.0.1
F5Big-Ip Global Traffic Manager>= 15.0.0, <= 15.1.2
F5Big-Ip Global Traffic Manager>= 16.0.0, < 16.0.1
F5Big-Ip Link Controller>= 15.0.0, < 15.1.2
F5Big-Ip Link Controller>= 16.0.0, < 16.0.1
F5Big-Ip Local Traffic Manager>= 15.0.0, < 15.1.2
F5Big-Ip Local Traffic Manager>= 16.0.0, < 16.0.1
F5Big-Ip Policy Enforcement Manager>= 15.0.0, < 15.1.2
F5Big-Ip Policy Enforcement Manager>= 16.0.0, < 16.0.1
F5Ssl Orchestrator>= 15.0.0, < 15.1.2
F5Ssl Orchestrator>= 16.0.0, < 16.0.1

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2020-5947?
In versions 16.0.0-16.0.0.1 and 15.1.0-15.1.1, on specific BIG-IP platforms, attackers may be able to obtain TCP sequence numbers from the BIG-IP system that can be reused in future connections with the same source and destination port and IP numbers. Only these platforms are affected: BIG-IP 2000 series (C112), BIG-IP 4000 series (C113), BIG-IP i2000 series (C117), BIG-IP i4000 series (C115), BIG-IP Virtual Edition (VE).
How severe is CVE-2020-5947?
CVE-2020-5947 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 0.69% probability of exploitation in the next 30 days.
How do I fix CVE-2020-5947?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST