Is CVE-2020-1730 in the CISA KEV catalog?

No. CVE-2020-1730 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-1730?

CVE-2020-1730 has a CVSS v3 base score of 5.3 (MEDIUM).

What is the EPSS score for CVE-2020-1730?

CVE-2020-1730 has an EPSS score of 3.06% (86th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-1730?

Upgrade libssh on debian 11 to 0.9.4-1 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2020-1730

MEDIUMEPSS 86th pctl

5.3

CVSS v3

NVD

Description

A flaw was found in libssh versions before 0.8.9 and before 0.9.4 in the way it handled AES-CTR (or DES ciphers if enabled) ciphers. The server or client could crash when the connection hasn't been fully initialized and the system tries to cleanup the ciphers when closing the connection. The biggest threat from this vulnerability is system availability.

CWE-476NULL Pointer Dereference

How to fix

Remediation Available

libsshDebian

Fixed in:0.9.4-1CVE-2020-1730

libsshUbuntu

Fixed in:0.8.0~20170825.94fa1e38-1ubuntu0.6USN-4327-1

libssh-4Ubuntu

Fixed in:0.8.0~20170825.94fa1e38-1ubuntu0.6USN-4327-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityLow

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Exploit Intelligence

3.06%probability of exploitation in 30 days

86thpercentile

Elevated risk: more likely to be exploited than 86% of all known CVEs.

References

Patch1

oracle.com

Vendor Advisory1

libssh.org

Third-Party Advisory3

Other references2

Related Vulnerabilities

Other CWE-476 (NULL Pointer Dereference) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-21758	High	7.5	92%	-	Fix
CVE-2023-21547	High	7.5	88%	-	Fix
CVE-2014-3470	Medium	4.3	86%	-	Fix
CVE-2021-44224	High	8.2	82%	-	Fix
CVE-2016-0742	High	7.5	82%	-	Fix
CVE-2009-1386	Medium	5.0	80%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.