How severe is CVE-2021-43565?

CVE-2021-43565 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-43565 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (58th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-43565?

CVE-2021-43565 affects Golang Ssh. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-43565?

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-2021-43565 published?

CVE-2021-43565 was published on 2022-09-06 and last updated on 2026-06-17.

CVE-2021-43565

CVE-2021-43565 is a high-severity vulnerability in Golang Ssh with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (58th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Golang Ssh
Published: 2022-09-06
Last modified: 2026-06-17

Description

The x/crypto/ssh package before 0.0.0-20211202192323-5770296d904e of golang.org/x/crypto allows an attacker to panic an SSH server.

Frequently asked questions

What is CVE-2021-43565?: The x/crypto/ssh package before 0.0.0-20211202192323-5770296d904e of golang.org/x/crypto allows an attacker to panic an SSH server.
How severe is CVE-2021-43565?: CVE-2021-43565 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-43565 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (58th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-43565?: CVE-2021-43565 affects Golang Ssh. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-43565?: 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-2021-43565 published?: CVE-2021-43565 was published on 2022-09-06 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:golang:ssh:*:*:*:*:*:*:*:*

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CVE-2022-27191 — High (CVSS 7.5): The golang.org/x/crypto/ssh package before 0.0.0-20220314234659-1baeb1ce4c0b for Go allows an attacker to crash a…
CVE-2020-29652 — High (CVSS 7.5): A nil pointer dereference in the golang.org/x/crypto/ssh component through v0.0.0-20201203163018-be400aefbc4c for Go…

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