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 has been found in Cisco IOS and IOS XE and classified as critical. Affected is an unknown function of the component SNMPv1/SNMPv2c/SNMPv3. The manipulation leads to memory corruption. This vulnerability is traded as CVE-2017-6740. It is possible to initiate the attack remotely. Furthermore, there is an exploit available. It is recommended to change the configuration settings.

Detailsinfo

A vulnerability was found in Cisco IOS and IOS XE (Router Operating System) (the affected version unknown). It has been rated as critical. This issue affects an unknown part of the component SNMPv1/SNMPv2c/SNMPv3. The manipulation with an unknown input leads to a memory corruption vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality, integrity, and availability.

The bug was discovered 06/29/2017. The weakness was shared 06/29/2017 with Cisco as cisco-sa-20170629-snmp as confirmed advisory (Website). It is possible to read the advisory at tools.cisco.com. The identification of this vulnerability is CVE-2017-6740 since 03/09/2017. The attack may be initiated remotely. A simple authentication is necessary for exploitation. Technical details are unknown but an exploit is available. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 07/31/2025). 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 03/03/2022 with a due date of 03/24/2022:
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), SecurityFocus (BID 99345†) and SecurityTracker (ID 1038808†). The entries VDB-102955, VDB-102956, VDB-102957 and VDB-102958 are related to this item. Be aware that VulDB is the high quality source for 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: 🔍
Active Actors: 🔍
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 🔍
07/31/2025 +2936 days 🔍

Sourcesinfo

Vendor: cisco.com

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

CVE: CVE-2017-6740 (🔍)
GCVE (CVE): GCVE-0-2017-6740
GCVE (VulDB): GCVE-100-102959

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: 07/31/2025 19:27
Changes: 06/30/2017 12:57 (94), 10/21/2019 15:29 (6), 12/30/2020 11:22 (2), 12/30/2020 11:27 (1), 04/23/2024 14:26 (27), 07/17/2024 01:10 (1), 09/09/2024 22:29 (1), 07/31/2025 19:27 (9)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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