CVE-2017-6737KEV · OVERDUECWE-119

Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability

High · published July 17, 2017

Patch now

Confirmed exploited, and the score agrees

CVSS calls it high at 8.8. It is confirmed in active exploitation. It sits in the 98.8th percentile for exploit probability.

1673
days past CISA
deadline
CVSS v3.0
8.8
EPSS
45%
Percentile
98.8
In the wild
Confirmed
What it is

🚨 An authenticated attacker can exploit a buffer overflow in SNMP to cause system chaos — think of it like a sneaky chef messing with the recipe before serving dinner! 🍽️ This vulnerability is akin to a restaurant where a customer can secretly swap key ingredients in the chef's signature dish. If they know the right recipe code (or in this case, the SNMP community string), they can completely alter the meal being served — or, in our case, commandeer the system. An attacker could leverage this vulnerability to execute arbitrary code, potentially giving them full control of the affected system, or simply cause it to reload unexpectedly. This not only disrupts the normal operations but could lead to data loss and a complete compromise of the system's integrity — absolutely devastating!

Put simply

This vulnerability is akin to a restaurant where a customer can secretly swap key ingredients in the chef's signature dish. If they know the right recipe code (or in this case, the SNMP community string), they can completely alter the meal being served — or, in our case, commandeer the system. The vulnerability stems from a buffer overflow in SNMP's implementation, allowing authenticated users to send crafted SNMP packets that exploit this flaw. It affects all versions of SNMP (1, 2c, and 3), and requires knowledge of either the read-only community string or user credentials.

What to do

An attacker could leverage this vulnerability to execute arbitrary code, potentially giving them full control of the affected system, or simply cause it to reload unexpectedly. This not only disrupts the normal operations but could lead to data loss and a complete compromise of the system's integrity — absolutely devastating! To protect your systems, ensure you patch to the latest version of SNMP available. Limit SNMP access to trusted sources only, and regularly review your SNMP settings to ensure they are secure! You've got this! Stay ahead by following these steps and keep your systems safe and sound! 🛡️

The record
Technical detail
CVSS v3.0
8.8 · HIGH
Vector
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.45240 · 98.8th percentile
Weakness
CWE-119 · Improper Restriction of Operations within the Bounds of a Memory Buffer
Published
2017-07-17T21:00Z
KEV added
2022-03-03 · due 2022-03-24
EPSS history
Timeline
  • 03 MAR 00:00Z
    Added to CISA KEV — remediate by Mar 24
    kev
  • 17 JUL 21:00Z
    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…
    cvelistv5