Is CVE-2015-5523 in the CISA KEV catalog?

No. CVE-2015-5523 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2015-5523?

CVE-2015-5523 has a CVSS v2 base score of 4.3 (MEDIUM).

What is the EPSS score for CVE-2015-5523?

CVE-2015-5523 has an EPSS score of 3.84% (89th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2015-5523?

Upgrade libtidy-0.99-0 on ubuntu 14.04 to 20091223cvs-1.2ubuntu1.1 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2015-5523

MEDIUMEPSS 89th pctl

4.3

CVSS v2

NVD

Description

The ParseValue function in lexer.c in tidy before 4.9.31 allows remote attackers to cause a denial of service (crash) via vectors involving multiple whitespace characters before an empty href, which triggers a large memory allocation.

CWE-119Buffer Overflow

How to fix

Remediation Available

libtidy-0.99-0Ubuntu

Fixed in:20091223cvs-1.2ubuntu1.1USN-2695-1

tidyUbuntu

Fixed in:20091223cvs-1.2ubuntu1.1USN-2695-1

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

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

3.84%probability of exploitation in 30 days

89thpercentile

Elevated risk: more likely to be exploited than 89% of all known CVEs.

References

Exploit3

Third-Party Advisory8

Other references3

Related Vulnerabilities

Other CWE-119 (Buffer Overflow) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-4966	Critical	9.4	100%	KEV + Ransom	Fix
CVE-2017-11882	High	7.8	100%	KEV + Ransom	-
CVE-2020-0796	Critical	10.0	100%	KEV + Ransom	-
CVE-2008-4250	Critical	9.8	99%	KEV	-
CVE-2017-15944	Critical	9.8	98%	KEV	Fix
CVE-2015-0014	High	10.0	97%	-	-

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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 2026-05-06.