Cisco IOS/IOS XE SNMPv1/SNMPv2c/SNMPv3 memory corruption

CVSS Meta Temp Score
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CTI Interest Score
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8.7$5k-$25k0.00

Summaryinfo

A vulnerability was found in Cisco IOS and IOS XE. It has been classified as critical. Affected by this issue is some unknown functionality of the component SNMPv1/SNMPv2c/SNMPv3. This manipulation causes memory corruption. This vulnerability is handled as CVE-2017-6742. The attack can be initiated remotely. Additionally, an exploit exists. It is advisable to modify the configuration settings.

Detailsinfo

A vulnerability classified as critical was found in Cisco IOS and IOS XE (Router Operating System) (unknown version). Affected by this vulnerability is an unknown code block of the component SNMPv1/SNMPv2c/SNMPv3. The manipulation with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The bug was discovered 06/29/2017. The weakness was released 06/29/2017 with Cisco as cisco-sa-20170629-snmp as confirmed advisory (Website). The advisory is shared at tools.cisco.com. This vulnerability is known as CVE-2017-6742 since 03/09/2017. The attack can be launched remotely. The requirement for exploitation is a single authentication. Technical details are unknown but an exploit is available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 01/13/2026). The advisory points out:

The Simple Network Management Protocol (SNMP) subsystem of Cisco IOS and IOS XE Software contains multiple vulnerabilities that could allow an authenticated, remote attacker to remotely execute code on an affected system or cause an affected system to reload.

It is declared as attacked. The vulnerability scanner Nessus provides a plugin with the ID 101268 (Cisco IOS SNMP Packet Handling Remote Buffer Overflow Multiple RCE (cisco-sa-20170629-snmp)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CISCO and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 316125 (Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerabilities (cisco-sa-20170629-snmp)). The advisory illustrates:

An attacker could exploit these vulnerabilities by sending a crafted SNMP packet to an affected system via IPv4 or IPv6. Only traffic directed to an affected system can be used to exploit these vulnerabilities.
The CISA Known Exploited Vulnerabilities Catalog lists this issue since 04/19/2023 with a due date of 05/10/2023:
Apply updates per vendor instructions.

It is possible to mitigate the problem by applying the configuration setting . A possible mitigation has been published immediately after the disclosure of the vulnerability. The advisory contains the following remark:

Administrators are advised to allow only trusted users to have SNMP access on an affected system.

The vulnerability is also documented in the databases at Tenable (101268), EUVD (EUVD-2017-15796), SecurityFocus (BID 99345†) and SecurityTracker (ID 1038808†). Entries connected to this vulnerability are available at VDB-102955, VDB-102956, VDB-102957 and VDB-102958. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.8
VulDB Meta Temp Score: 8.7

VulDB Base Score: 8.8
VulDB Temp Score: 8.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

Vendor Base Score (Cisco): 8.8
Vendor Vector (Cisco): 🔍

NVD Base Score: 8.8
NVD Vector: 🔍

CNA Base Score: 8.8
CNA Vector: 🔍

CVSSv2info

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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Attacked

EPSS Score: 🔍
EPSS Percentile: 🔍

KEV Added: 🔍
KEV Due: 🔍
KEV Remediation: 🔍
KEV Ransomware: 🔍
KEV Notice: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 101268
Nessus Name: Cisco IOS SNMP Packet Handling Remote Buffer Overflow Multiple RCE (cisco-sa-20170629-snmp)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 103403
OpenVAS Name: SNMP Remote Code Execution Vulnerabilities in Cisco IOS Software
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Config
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Timelineinfo

03/09/2017 🔍
06/29/2017 +112 days 🔍
06/29/2017 +0 days 🔍
06/29/2017 +0 days 🔍
06/29/2017 +0 days 🔍
06/29/2017 +0 days 🔍
06/30/2017 +1 days 🔍
07/07/2017 +7 days 🔍
07/17/2017 +10 days 🔍
01/13/2026 +3102 days 🔍

Sourcesinfo

Vendor: cisco.com

Advisory: cisco-sa-20170629-snmp
Researcher: Cisco.
Organization: Cisco
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-6742 (🔍)
GCVE (CVE): GCVE-0-2017-6742
GCVE (VulDB): GCVE-100-102961
EUVD: 🔍

OVAL: 🔍

SecurityFocus: 99345 - Cisco IOS and IOS XE Software Multiple Remote Code Execution Vulnerabilities
SecurityTracker: 1038808

scip Labs: https://www.scip.ch/en/?labs.20150108
See also: 🔍

Entryinfo

Created: 06/30/2017 12:57
Updated: 01/13/2026 04:35
Changes: 06/30/2017 12:57 (94), 10/21/2019 15:53 (6), 12/30/2020 11:39 (2), 12/30/2020 11:43 (1), 04/28/2024 14:24 (28), 06/28/2024 02:00 (1), 09/09/2024 22:30 (1), 07/30/2025 07:07 (1), 07/31/2025 19:27 (9), 01/13/2026 04:35 (2)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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