Is CVE-2015-5291 in the CISA KEV catalog?

No. CVE-2015-5291 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2015-5291?

CVE-2015-5291 has a CVSS v2 base score of 6.8 (MEDIUM).

What is the EPSS score for CVE-2015-5291?

CVE-2015-5291 has an EPSS score of 3.63% (88th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2015-5291?

Upgrade mbed tls to 2.1.2 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2015-5291

MEDIUMEPSS 88th pctl

6.8

CVSS v2

NVD

Description

Heap-based buffer overflow in PolarSSL 1.x before 1.2.17 and ARM mbed TLS (formerly PolarSSL) 1.3.x before 1.3.14 and 2.x before 2.1.2 allows remote SSL servers to cause a denial of service (client crash) and possibly execute arbitrary code via a long hostname to the server name indication (SNI) extension, which is not properly handled when creating a ClientHello message. NOTE: this identifier has been SPLIT per ADT3 due to different affected version ranges. See CVE-2015-8036 for the session ticket issue that was introduced in 1.3.0.

CWE-119Buffer Overflow

How to fix

Remediation Available

mbed tlsNVD

Affected:>= 2.0.0, < 2.1.2Fixed in:2.1.2CVE-2015-5291derived from NVD

polarsslNVD

Affected:>= 1.0.0, < 1.2.17Fixed in:1.2.17CVE-2015-5291derived from NVD

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

3.63%probability of exploitation in 30 days

88thpercentile

Elevated risk: more likely to be exploited than 88% of all known CVEs.

References

Vendor Advisory1

tls.mbed.org

Third-Party Advisory9

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 2026-06-05.