Buffer Overflow Vulnerabilities in Cisco IOS SNMP Subsystem
CVE-2017-6736

8.8HIGH

Key Information:

Vendor

Cisco
Status
iOS
Universal Product
Vendor
CVE Published:
17 July 2017

Badges

👾 Exploit Exists🟡 Public PoC🟣 EPSS 86%🦅 CISA Reported

What is CVE-2017-6736?

The SNMP subsystem of Cisco IOS versions 12.0 through 12.4 and 15.0 through 15.6, as well as IOS XE versions 2.2 through 3.17, contains multiple vulnerabilities stemming from a buffer overflow condition. An attacker, with valid credentials for SNMP Version 3 or knowledge of the read-only community string for SNMP Versions 1 and 2c, could send specially crafted SNMP packets to trigger these vulnerabilities, allowing for remote code execution or possible system reload. Any device with SNMP enabled, where affected MIBs or OIDs are included, remains susceptible to exploitation by malicious actors.

CISA has reported CVE-2017-6736

CISA provides regional cyber and physical services to support security and resilience across the United States. CISA monitor the most dangerious vulnerabilities and have identifed CVE-2017-6736 as being exploited but is not known by the CISA to be used in ransomware campaigns. This is subject to change at pace

The CISA's recommendation is: Apply updates per vendor instructions.

Affected Version(s)

IOS 12.1(3a)XI9

IOS 12.1(3)XI

IOS 12.1(3a)XI8

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2017-6736 - Proof of Concept

CiscoIOSSNMPToolkit
Created by GarnetSunset

CiscoSpectreTakeover
Created by GarnetSunset

References

https://sec.cloudapps.cisco.com/security/center/content/C...

EPSS Score

86% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

CVSS V3.0

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🦅

    CISA Reported

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

.