CVE-2015-5621

HIGHEPSS 98th pctl

7.5

CVSS v3

Description

The snmp_pdu_parse function in snmp_api.c in net-snmp 5.7.2 and earlier does not remove the varBind variable in a netsnmp_variable_list item when parsing of the SNMP PDU fails, which allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a crafted packet.

CWE-19 CWE-190Integer Overflow

How to fix

Remediation Available

net-snmpDebian

Fixed in:5.7.3+dfsg-1.1CVE-2015-5621

libsnmp30Ubuntu

Fixed in:5.7.2~dfsg-8.1ubuntu3.1USN-2711-1

net-snmpUbuntu

Fixed in:5.7.2~dfsg-8.1ubuntu3.1USN-2711-1

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

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

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

40.00%probability of exploitation in 30 days

98thpercentile

Very high risk: more likely to be exploited than 98% of all known CVEs.

References

Exploit1

openwall.com

Other references14

Related Vulnerabilities

Other CWE-19 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2015-5477	High	7.8	91%	-	Fix
CVE-2014-9034	Medium	5.0	83%	-	Fix
CVE-2016-4977	High	8.8	79%	-	-
CVE-2016-3236	Critical	9.8	77%	-	-
CVE-2014-7141	Medium	6.4	76%	-	Fix
CVE-2015-5374	High	7.8	74%	-	-

Common questions

How do I fix CVE-2015-5621?

Published advisories record a fix for 3 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2015-5621 being actively exploited?

Not that we know of. CVE-2015-5621 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 40.0% is the estimated probability that it will be exploited in the next 30 days. That is higher than 98% of all scored CVEs.

How severe is CVE-2015-5621?

CVE-2015-5621 has a CVSS v3 base score of 7.5, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2015-5621 affect?

Published advisories record a fix for net-snmp (Debian), libsnmp30 (Ubuntu), net-snmp (Ubuntu). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

Embed a live status badge for CVE-2015-5621

Markdown

[![CVE-2015-5621](https://tridentstack.com/cve/badge/CVE-2015-5621.svg)](https://tridentstack.com/cve/CVE-2015-5621)

HTML

<a href="https://tridentstack.com/cve/CVE-2015-5621"><img src="https://tridentstack.com/cve/badge/CVE-2015-5621.svg" alt="CVE-2015-5621"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

See how it works Start freeThis CVE lookup is free and always will be.

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.