How severe is CVE-2026-34227?

CVE-2026-34227 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-34227 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-34227?

CVE-2026-34227 affects Bishopfox Sliver. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-34227?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-34227 have an EU (EUVD) identifier?

Yes. CVE-2026-34227 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17490.

When was CVE-2026-34227 published?

CVE-2026-34227 was published on 2026-03-31 and last updated on 2026-06-17.

CVE-2026-34227

CVE-2026-34227 is a high-severity vulnerability in Bishopfox Sliver with a CVSS 3.x base score of 8.8. 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-306.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v4: 5.9
EPSS exploit prediction: 0% (32nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-17490
Weakness: CWE-306
Affected product: Bishopfox Sliver
Published: 2026-03-31
Last modified: 2026-06-17

Description

Sliver is a command and control framework that uses a custom Wireguard netstack. Prior to version 1.7.4, a single click on a malicious link gives an unauthenticated attacker immediate, silent control over every active C2 session or beacon, capable of exfiltrating all collected target data (e.g. SSH keys, ntds.dit) or destroying the entire compromised infrastructure, entirely through the operator's own browser. This issue has been patched in version 1.7.4.

Frequently asked questions

What is CVE-2026-34227?: Sliver is a command and control framework that uses a custom Wireguard netstack. Prior to version 1.7.4, a single click on a malicious link gives an unauthenticated attacker immediate, silent control over every active C2 session or beacon, capable of exfiltrating all collected target data (e.g. SSH keys, ntds.dit) or destroying the entire compromised infrastructure, entirely through the operator's own browser. This issue has been patched in version 1.7.4.
How severe is CVE-2026-34227?: CVE-2026-34227 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-34227 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-34227?: CVE-2026-34227 affects Bishopfox Sliver. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-34227?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-34227 have an EU (EUVD) identifier?: Yes. CVE-2026-34227 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17490.
When was CVE-2026-34227 published?: CVE-2026-34227 was published on 2026-03-31 and last updated on 2026-06-17.

References

https://github.com/BishopFox/sliver/security/advisories/GHSA-6fpf-248c-m7wm

Affected products (1)

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

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