How severe is CVE-2025-43878?

CVE-2025-43878 has a CVSS 3.x base score of 6.0, rated medium severity. It is exploitable over local access with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2025-43878 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-43878?

CVE-2025-43878 primarily affects F5 F5os-a. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-43878?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-43878 have an EU (EUVD) identifier?

Yes. CVE-2025-43878 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-13943.

When was CVE-2025-43878 published?

CVE-2025-43878 was published on 2025-05-07 and last updated on 2026-06-17.

CVE-2025-43878

CVE-2025-43878 is a medium-severity vulnerability in F5 F5os-a with a CVSS 3.x base score of 6.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-149.

Key facts

Severity: Medium (CVSS 3.x base score 6.0)
CVSS v4: 8.3
EPSS exploit prediction: 0% (4th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-13943
Weakness: CWE-149
Affected product: F5 F5os-a
Published: 2025-05-07
Last modified: 2026-06-17

Description

When running in Appliance mode, an authenticated attacker assigned the Administrator or Resource Administrator role may be able to bypass Appliance mode restrictions utilizing system diagnostics tcpdump command utility on a F5OS-C/A system. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Frequently asked questions

What is CVE-2025-43878?: When running in Appliance mode, an authenticated attacker assigned the Administrator or Resource Administrator role may be able to bypass Appliance mode restrictions utilizing system diagnostics tcpdump command utility on a F5OS-C/A system. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
How severe is CVE-2025-43878?: CVE-2025-43878 has a CVSS 3.x base score of 6.0, rated medium severity. It is exploitable over local access with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2025-43878 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-43878?: CVE-2025-43878 primarily affects F5 F5os-a. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-43878?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-43878 have an EU (EUVD) identifier?: Yes. CVE-2025-43878 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-13943.
When was CVE-2025-43878 published?: CVE-2025-43878 was published on 2025-05-07 and last updated on 2026-06-17.

References

https://my.f5.com/manage/s/article/K000139502

Affected products (2)

cpe:2.3:o:f5:f5os-a:*:*:*:*:*:*:*:*
cpe:2.3:o:f5:f5os-c:*:*:*:*:*:*:*:*

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