Is CVE-2015-1855 in the CISA KEV catalog?

No. CVE-2015-1855 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2015-1855?

CVE-2015-1855 has a CVSS v3 base score of 5.9 (MEDIUM).

What is the EPSS score for CVE-2015-1855?

CVE-2015-1855 has an EPSS score of 2.81% (85th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2015-1855?

Upgrade libruby1.9.1 on ubuntu 14.04 to 1.9.3.484-2ubuntu1.3 or later. Fixes are available for 12 affected products.

CVE & CISA-KEV Catalog

CVE-2015-1855

MEDIUMEPSS 85th pctl

5.9

CVSS v3

NVD

Description

verify_certificate_identity in the OpenSSL extension in Ruby before 2.0.0 patchlevel 645, 2.1.x before 2.1.6, and 2.2.x before 2.2.2 does not properly validate hostnames, which allows remote attackers to spoof servers via vectors related to (1) multiple wildcards, (1) wildcards in IDNA names, (3) case sensitivity, and (4) non-ASCII characters.

CWE-20Improper Input Validation

How to fix

Remediation Available

libruby1.9.1Ubuntu

Fixed in:1.9.3.484-2ubuntu1.3USN-3365-1

libruby2.0Ubuntu

Fixed in:2.0.0.484-1ubuntu2.4USN-3365-1

libruby2.3Ubuntu

Fixed in:2.3.1-2~16.04.2USN-3365-1

ruby1.9.1Ubuntu

Fixed in:1.9.3.484-2ubuntu1.3USN-3365-1

ruby2.0Ubuntu

Fixed in:2.0.0.484-1ubuntu2.4USN-3365-1

ruby2.3Ubuntu

Fixed in:2.3.1-2~16.04.2USN-3365-1

Ruby 3.0Windows application

Affected:2.2.0 2.2.2Fixed in:2.2.2RubyInstaller Team

Affected:2.1.0 2.1.6Fixed in:2.1.6RubyInstaller Team

Ruby 3.1Windows application

Affected:2.2.0 2.2.2Fixed in:2.2.2RubyInstaller Team

Affected:2.1.0 2.1.6Fixed in:2.1.6RubyInstaller Team

Ruby 3.2Windows application

Affected:2.2.0 2.2.2Fixed in:2.2.2RubyInstaller Team

Affected:2.1.0 2.1.6Fixed in:2.1.6RubyInstaller Team

Ruby 3.2 with MSYS2Windows application

Affected:2.2.0 2.2.2Fixed in:2.2.2RubyInstaller Team

Affected:2.1.0 2.1.6Fixed in:2.1.6RubyInstaller Team

Ruby 3.3Windows application

Affected:2.1.0 2.1.6Fixed in:2.1.6RubyInstaller Team

Affected:2.2.0 2.2.2Fixed in:2.2.2RubyInstaller Team

Ruby 3.3 with MSYS2Windows application

Affected:2.2.0 2.2.2Fixed in:2.2.2RubyInstaller Team

Affected:2.1.0 2.1.6Fixed in:2.1.6RubyInstaller Team

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 ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

2.81%probability of exploitation in 30 days

85thpercentile

Elevated risk: more likely to be exploited than 85% of all known CVEs.

References

Vendor Advisory1

ruby-lang.org

Third-Party Advisory5

Related Vulnerabilities

Other CWE-20 (Improper Input Validation) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-3400	Critical	10.0	100%	KEV + Ransom	-
CVE-2021-45105	Medium	5.9	100%	-	Fix
CVE-2021-44228	Critical	10.0	100%	KEV + Ransom	Fix
CVE-2021-21985	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2018-7600	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2020-3452	High	7.5	100%	KEV	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.