CVE-2025-53856

Q: How do I fix CVE-2025-53856?

Upgrade big-ip global traffic manager to 17.1.3 or later.

Q: Is CVE-2025-53856 being actively exploited?

Not that we know of. CVE-2025-53856 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.33% is the estimated probability that it will be exploited in the next 30 days. That is higher than 25% of all scored CVEs.

Q: How severe is CVE-2025-53856?

CVE-2025-53856 has a CVSS v3 base score of 7.5, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2025-53856 affect?

Published advisories record a fix for big-ip global traffic manager (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

HIGH

7.5

CVSS v3

NVD

Description

When a virtual server, network address translation (NAT) object, or secure network address translation (SNAT) object uses the embedded Packet Velocity Acceleration (ePVA) feature, undisclosed traffic can cause the Traffic Management Microkernel (TMM) to terminate. To determine which BIG-IP platforms have an ePVA chip refer to K12837: Overview of the ePVA feature https://my.f5.com/manage/s/article/K12837 . Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

CWE-705

How to fix

Remediation Available

big-ip global traffic managerNVD

Affected:>= 17.1.0, < 17.1.3Fixed in:17.1.3CVE-2025-53856derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

0.33%probability of exploitation in 30 days

25thpercentile

Low risk: more likely to be exploited than 25% of all known CVEs.

References

Vendor Advisory1

my.f5.com

Related Vulnerabilities

Other CWE-705 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-9848	High	7.3	0.6%	-	-
CVE-2024-45433	Medium	6.5	0.5%	-	-
CVE-2026-3264	Medium	6.3	0.4%	-	-
CVE-2026-3262	Medium	6.3	0.4%	-	-
CVE-2026-10271	Medium	6.3	0.3%	-	-
CVE-2026-40208	Low	3.7	0.2%	-	Fix

Common questions

How do I fix CVE-2025-53856?

Upgrade big-ip global traffic manager to 17.1.3 or later.

Is CVE-2025-53856 being actively exploited?

Not that we know of. CVE-2025-53856 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.33% is the estimated probability that it will be exploited in the next 30 days. That is higher than 25% of all scored CVEs.

How severe is CVE-2025-53856?

CVE-2025-53856 has a CVSS v3 base score of 7.5, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2025-53856 affect?

Published advisories record a fix for big-ip global traffic manager (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-10-21.