Is CVE-2016-5873 in the CISA KEV catalog?

No. CVE-2016-5873 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2016-5873?

CVE-2016-5873 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2016-5873?

CVE-2016-5873 has an EPSS score of 4.70% (91th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2016-5873?

Upgrade php-pecl-http on debian 11 to 3.0.1-0.1 or later.

CVE & CISA-KEV Catalog

CVE-2016-5873

CRITICALEPSS 91th pctl

9.8

CVSS v3

NVD

Description

Buffer overflow in the HTTP URL parsing functions in pecl_http before 3.0.1 might allow remote attackers to execute arbitrary code via non-printable characters in a URL.

CWE-119Buffer Overflow

How to fix

Remediation Available

php-pecl-httpDebian

Fixed in:3.0.1-0.1CVE-2016-5873

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

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

4.70%probability of exploitation in 30 days

91stpercentile

High risk: more likely to be exploited than 91% of all known CVEs.

References

Patch2

Exploit1

bugs.php.net

Vendor Advisory1

pecl.php.net

Third-Party Advisory1

openwall.com

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 2026-05-13.