How severe is CVE-2023-34758?

CVE-2023-34758 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-34758 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-34758?

CVE-2023-34758 affects Bishopfox Sliver. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-34758?

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.

When was CVE-2023-34758 published?

CVE-2023-34758 was published on 2023-08-28 and last updated on 2026-06-17.

CVE-2023-34758

CVE-2023-34758 is a high-severity vulnerability in Bishopfox Sliver with a CVSS 3.x base score of 8.1. 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-327.

Key facts

Severity: High (CVSS 3.x base score 8.1)
EPSS exploit prediction: 1% (44th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-327
Affected product: Bishopfox Sliver
Published: 2023-08-28
Last modified: 2026-06-17

Description

Sliver from v1.5.x to v1.5.39 has an improper cryptographic implementation, which allows attackers to execute a man-in-the-middle attack via intercepted and crafted responses.

Frequently asked questions

What is CVE-2023-34758?: Sliver from v1.5.x to v1.5.39 has an improper cryptographic implementation, which allows attackers to execute a man-in-the-middle attack via intercepted and crafted responses.
How severe is CVE-2023-34758?: CVE-2023-34758 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-34758 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-34758?: CVE-2023-34758 affects Bishopfox Sliver. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-34758?: 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.
When was CVE-2023-34758 published?: CVE-2023-34758 was published on 2023-08-28 and last updated on 2026-06-17.

References

Affected products (1)

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

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