Is CVE-2019-3855 in the CISA KEV catalog?

No. CVE-2019-3855 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2019-3855?

CVE-2019-3855 has a CVSS v3 base score of 8.8 (HIGH).

What is the EPSS score for CVE-2019-3855?

CVE-2019-3855 has an EPSS score of 9.22% (95th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2019-3855?

Upgrade libssh2 on debian 11 to 1.8.0-2.1 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2019-3855

HIGHEPSS 95th pctl

8.8

CVSS v3

NVD

Description

An integer overflow flaw which could lead to an out of bounds write was discovered in libssh2 before 1.8.1 in the way packets are read from the server. A remote attacker who compromises a SSH server may be able to execute code on the client system when a user connects to the server.

CWE-190Integer Overflow CWE-787Out-of-bounds Write

How to fix

Remediation Available

libssh2Debian

Fixed in:1.8.0-2.1CVE-2019-3855

libssh2Ubuntu

Fixed in:1.5.0-2ubuntu0.1+esm1USN-5308-1

libssh2-1Ubuntu

Fixed in:1.5.0-2ubuntu0.1+esm1USN-5308-1

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 InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

9.22%probability of exploitation in 30 days

95thpercentile

High risk: more likely to be exploited than 95% of all known CVEs.

References

Related Vulnerabilities

Other CWE-190 (Integer Overflow) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-16040	Medium	6.5	100%	-	Fix
CVE-2019-11477	High	7.5	99%	-	Fix
CVE-2023-44443	High	7.8	94%	-	Fix
CVE-2014-0569	High	9.3	90%	-	-
CVE-2017-3599	High	7.5	90%	-	Fix
CVE-2023-21716	Critical	9.8	82%	-	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.