How severe is CVE-2001-0361?

CVE-2001-0361 has a CVSS 2.0 base score of 4.0, rated medium severity.

Is CVE-2001-0361 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2001-0361?

CVE-2001-0361 primarily affects Openbsd Openssh. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2001-0361?

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

When was CVE-2001-0361 published?

CVE-2001-0361 was published on 2001-06-27 and last updated on 2026-06-16.

CVE-2001-0361

CVE-2001-0361 is a medium-severity vulnerability in Openbsd Openssh with a CVSS 2.0 base score of 4.0. 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-310.

Key facts

Severity: Medium (CVSS 2.0 base score 4.0)
EPSS exploit prediction: 3% (83rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-310
Affected product: Openbsd Openssh
Published: 2001-06-27
Last modified: 2026-06-16

Description

Implementations of SSH version 1.5, including (1) OpenSSH up to version 2.3.0, (2) AppGate, and (3) ssh-1 up to version 1.2.31, in certain configurations, allow a remote attacker to decrypt and/or alter traffic via a "Bleichenbacher attack" on PKCS#1 version 1.5.

Frequently asked questions

What is CVE-2001-0361?: Implementations of SSH version 1.5, including (1) OpenSSH up to version 2.3.0, (2) AppGate, and (3) ssh-1 up to version 1.2.31, in certain configurations, allow a remote attacker to decrypt and/or alter traffic via a "Bleichenbacher attack" on PKCS#1 version 1.5.
How severe is CVE-2001-0361?: CVE-2001-0361 has a CVSS 2.0 base score of 4.0, rated medium severity.
Is CVE-2001-0361 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2001-0361?: CVE-2001-0361 primarily affects Openbsd Openssh. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2001-0361?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2001-0361 published?: CVE-2001-0361 was published on 2001-06-27 and last updated on 2026-06-16.

References

Affected products (4)

cpe:2.3:a:openbsd:openssh:1.2.3:*:*:*:*:*:*:*
cpe:2.3:a:openbsd:openssh:2.1:*:*:*:*:*:*:*
cpe:2.3:a:openbsd:openssh:2.1.1:*:*:*:*:*:*:*
cpe:2.3:a:ssh:ssh:*:*:*:*:*:*:*:*

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