How severe is CVE-2021-34422?

CVE-2021-34422 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-34422 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-34422?

CVE-2021-34422 affects Keybase. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-34422?

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-2021-34422 published?

CVE-2021-34422 was published on 2021-11-11 and last updated on 2026-06-17.

CVE-2021-34422

CVE-2021-34422 is a high-severity vulnerability in Keybase with a CVSS 3.x base score of 7.2. 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-22.

Key facts

Severity: High (CVSS 3.x base score 7.2)
CVSS v2: 6.0
EPSS exploit prediction: 1% (68th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-22
Affected product: Keybase
Published: 2021-11-11
Last modified: 2026-06-17

Description

The Keybase Client for Windows before version 5.7.0 contains a path traversal vulnerability when checking the name of a file uploaded to a team folder. A malicious user could upload a file to a shared folder with a specially crafted file name which could allow a user to execute an application which was not intended on their host machine. If a malicious user leveraged this issue with the public folder sharing feature of the Keybase client, this could lead to remote code execution.

Frequently asked questions

What is CVE-2021-34422?: The Keybase Client for Windows before version 5.7.0 contains a path traversal vulnerability when checking the name of a file uploaded to a team folder. A malicious user could upload a file to a shared folder with a specially crafted file name which could allow a user to execute an application which was not intended on their host machine. If a malicious user leveraged this issue with the public folder sharing feature of the Keybase client, this could lead to remote code execution.
How severe is CVE-2021-34422?: CVE-2021-34422 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-34422 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-34422?: CVE-2021-34422 affects Keybase. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-34422?: 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-2021-34422 published?: CVE-2021-34422 was published on 2021-11-11 and last updated on 2026-06-17.

References

https://explore.zoom.us/en/trust/security/security-bulletin

Affected products (1)

cpe:2.3:a:keybase:keybase:*:*:*:*:*:windows:*:*

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