Buffer overflow in Cisco iOS
CVE-2017-6739
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.
Vulnerability class: Buffer Overflow
EPSS: 0.105 (95.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Cisco Ios
- Cisco Ios_xe
- Intellishield Universal Product — versions N/A
Weakness classification (CWE)
CISA KEV (Known Exploited Vulnerabilities)
This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.
BOD 22-01 due date: .
Required action: Apply updates per vendor instructions.
Public proof-of-concept exploits
References
- psirt@cisco.com (Vendor Advisory)
- af854a3a-2127-422b-91ae-364da2661108 (Broken Link, Third Party Advisory, VDB Entry)
- af854a3a-2127-422b-91ae-364da2661108 (Broken Link, Third Party Advisory, VDB Entry)
- af854a3a-2127-422b-91ae-364da2661108 (Vendor Advisory)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)
Frequently asked questions
- What is CVE-2017-6739?
- CVE-2017-6739 is a high-severity vulnerability in Cisco iOS, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 8.8/10. Published 2017-07-17.
- How severe is CVE-2017-6739?
- High severity. CVSS v3 base score is 8.8 out of 10.
- Is CVE-2017-6739 known to be exploited?
- Yes. CVE-2017-6739 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-03-03), indicating it is being actively exploited. 3 public proof-of-concept repositories are indexed.