How severe is CVE-2023-32691?

CVE-2023-32691 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability none.

Is CVE-2023-32691 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-2023-32691?

CVE-2023-32691 affects Go Simple Tunnel Project Go Simple Tunnel. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-32691?

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

When was CVE-2023-32691 published?

CVE-2023-32691 was published on 2023-05-30 and last updated on 2026-06-17.

CVE-2023-32691

CVE-2023-32691 is a medium-severity vulnerability in Go Simple Tunnel Project Go Simple Tunnel with a CVSS 3.x base score of 5.9. 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-203.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
EPSS exploit prediction: 1% (43rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-203
Affected product: Go Simple Tunnel Project Go Simple Tunnel
Published: 2023-05-30
Last modified: 2026-06-17

Description

gost (GO Simple Tunnel) is a simple tunnel written in golang. Sensitive secrets such as passwords, token and API keys should be compared only using a constant-time comparison function. Untrusted input, sourced from a HTTP header, is compared directly with a secret. Since this comparison is not secure, an attacker can mount a side-channel timing attack to guess the password. As a workaround, this can be easily fixed using a constant time comparing function such as `crypto/subtle`'s `ConstantTimeCompare`.

Frequently asked questions

What is CVE-2023-32691?: gost (GO Simple Tunnel) is a simple tunnel written in golang. Sensitive secrets such as passwords, token and API keys should be compared only using a constant-time comparison function. Untrusted input, sourced from a HTTP header, is compared directly with a secret. Since this comparison is not secure, an attacker can mount a side-channel timing attack to guess the password. As a workaround, this can be easily fixed using a constant time comparing function such as `crypto/subtle`'s `ConstantTimeCompare`.
How severe is CVE-2023-32691?: CVE-2023-32691 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability none.
Is CVE-2023-32691 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-2023-32691?: CVE-2023-32691 affects Go Simple Tunnel Project Go Simple Tunnel. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-32691?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2023-32691 published?: CVE-2023-32691 was published on 2023-05-30 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:go_simple_tunnel_project:go_simple_tunnel:*:*:*:*:*:go:*:*

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