How severe is CVE-2025-27090?

CVE-2025-27090 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2025-27090 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-27090?

CVE-2025-27090 affects Bishopfox Sliver. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-27090?

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

Does CVE-2025-27090 have an EU (EUVD) identifier?

Yes. CVE-2025-27090 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-4563.

When was CVE-2025-27090 published?

CVE-2025-27090 was published on 2025-02-19 and last updated on 2026-06-17.

CVE-2025-27090

CVE-2025-27090 is a medium-severity vulnerability in Bishopfox Sliver with a CVSS 3.x base score of 5.3. 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-918.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v4: 6.9
EPSS exploit prediction: 1% (43rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-4563
Weakness: CWE-918
Affected product: Bishopfox Sliver
Published: 2025-02-19
Last modified: 2026-06-17

Description

Sliver is an open source cross-platform adversary emulation/red team framework, it can be used by organizations of all sizes to perform security testing. The reverse port forwarding in sliver teamserver allows the implant to open a reverse tunnel on the sliver teamserver without verifying if the operator instructed the implant to do so. The only impact that has been shown is the exposure of the server's IP address to a third party. This issue has been addressed in version 1.5.43 and all users are advised to upgrade. There are no known workarounds for this vulnerability.

Frequently asked questions

What is CVE-2025-27090?: Sliver is an open source cross-platform adversary emulation/red team framework, it can be used by organizations of all sizes to perform security testing. The reverse port forwarding in sliver teamserver allows the implant to open a reverse tunnel on the sliver teamserver without verifying if the operator instructed the implant to do so. The only impact that has been shown is the exposure of the server's IP address to a third party. This issue has been addressed in version 1.5.43 and all users are advised to upgrade. There are no known workarounds for this vulnerability.
How severe is CVE-2025-27090?: CVE-2025-27090 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2025-27090 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-27090?: CVE-2025-27090 affects Bishopfox Sliver. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-27090?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-27090 have an EU (EUVD) identifier?: Yes. CVE-2025-27090 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-4563.
When was CVE-2025-27090 published?: CVE-2025-27090 was published on 2025-02-19 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:bishopfox:sliver:*:*:*:*:*:*:*:*

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