CVE-2017-6738KEV · 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 95.8th percentile for exploit probability.

1673
days past CISA
deadline
CVSS v3.0
8.8
EPSS
11%
Percentile
95.8
In the wild
Confirmed
What it is

🚨 An authenticated attacker can exploit buffer overflows in Cisco's SNMP, remotely executing code or even causing a complete system reload! 🔥 Think of the SNMP protocol as a telephone line that's supposed to connect you only to your trusted contacts. However, if someone knows your secret passcode, they can dial in and take over the conversation, leading to absolute mayhem! An attacker could gain full control over the affected device or trigger a system restart, leaving your network vulnerable and potentially exposing sensitive information. Imagine your system going down at the worst possible moment — not great for business continuity!

Put simply

Think of the SNMP protocol as a telephone line that's supposed to connect you only to your trusted contacts. However, if someone knows your secret passcode, they can dial in and take over the conversation, leading to absolute mayhem! This vulnerability arises from a buffer overflow condition in the SNMP subsystem of Cisco IOS and IOS XE Software, affecting all versions of SNMP (1, 2c, and 3). An attacker can exploit this by sending a specially crafted SNMP packet to the affected system, allowing for remote code execution if they know the read-only community string or possess valid credentials.

What to do

An attacker could gain full control over the affected device or trigger a system restart, leaving your network vulnerable and potentially exposing sensitive information. Imagine your system going down at the worst possible moment — not great for business continuity! To protect your systems, ensure to apply the recommended workarounds immediately and keep an eye out for updates from Cisco regarding vulnerable MIBs or OIDs. Use the Cisco IOS Software Checker to verify if you're running a patched version. You've got this! By following these steps, you can secure your network and keep those pesky attackers at bay! 🛡️

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
0.10855 · 95.8th 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
    The Simple Network Management Protocol (SNMP) subsystem of Cisco IOS and IOS XE Software contains multiple vulnerabilities that could allow an authenticated…
    cvelistv5