CVE-2017-6740
Summary
| CVE | CVE-2017-6740 |
|---|---|
| State | PUBLISHED |
| Assigner | cisco |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2017-07-17 21:29:00 UTC |
| Updated | 2026-04-21 18:09:20 UTC |
| Description | 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. 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 vulnerabilities are due to a buffer overflow condition in the SNMP subsystem of the affected software. The vulnerabilities affect all versions of SNMP - Versions 1, 2c, and 3. To exploit these vulnerabilities via SNMP Version 2c or earlier, the attacker must know the SNMP read-only community string for the affected system. To exploit these vulnerabilities via SNMP Version 3, the attacker must have user credentials for the affected system. A successful exploit could allow the attacker to execute arbitrary code and obtain full control of the affected system or cause the affected system to reload. Customers are advised to apply the workaround as contained in the Workarounds section below. Fixed software information is available via the Cisco IOS Software Checker. All devices that have enabled SNMP and have not explicitly excluded the affected MIBs or OIDs should be considered vulnerable. There are workarounds that address these vulnerabilities. |
Risk And Classification
Primary CVSS: v3.1 8.8 HIGH from [email protected]
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS: 0.106360000 probability, percentile 0.933320000 (date 2026-04-25)
CISA KEV: Listed on 2022-03-03; due 2022-03-24; ransomware use Unknown
Problem Types: CWE-119 | CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Primary | 8.8 | HIGH | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| 3.0 | [email protected] | Secondary | 8.8 | HIGH | CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| 3.0 | CNA | CVSSV3_0 | 8.8 | HIGH | CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| 2.0 | [email protected] | Primary | 9 | AV:N/AC:L/Au:S/C:C/I:C/A:C |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
LowUser Interaction
NoneScope
UnchangedConfidentiality
HighIntegrity
HighAvailability
HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v3.0 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
LowUser Interaction
NoneScope
UnchangedConfidentiality
HighIntegrity
HighAvailability
HighCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v2.0 Breakdown
Access Vector
NetworkAccess Complexity
LowAuthentication
SingleConfidentiality
CompleteIntegrity
CompleteAvailability
CompleteAV:N/AC:L/Au:S/C:C/I:C/A:C
CISA Known Exploited Vulnerability
| Vendor | Cisco |
|---|---|
| Product | IOS and IOS XE Software |
| Name | Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability |
| Required Action | Apply updates per vendor instructions. |
| Notes | https://nvd.nist.gov/vuln/detail/CVE-2017-6740 |
NVD Known Affected Configurations (CPE 2.3)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Cisco | IOS | affected 12.2(14)ZA | Not specified |
| CNA | Cisco | IOS | affected 12.2(14)ZA3 | Not specified |
| CNA | Cisco | IOS | affected 12.2(14)ZA2 | Not specified |
| CNA | Cisco | IOS | affected 12.2(14)ZA5 | Not specified |
| CNA | Cisco | IOS | affected 12.2(14)ZA4 | Not specified |
| CNA | Cisco | IOS | affected 12.2(14)ZA6 | Not specified |
| CNA | Cisco | IOS | affected 12.2(14)ZA7 | Not specified |
| CNA | Cisco | IOS | affected 12.2(25)SE2 | Not specified |
| CNA | Cisco | IOS | affected 12.2(29)SV2 | Not specified |
| CNA | Cisco | IOS | affected 12.2(17d)SXB6 | Not specified |
| CNA | Cisco | IOS | affected 12.2(17d)SXB11 | Not specified |
| CNA | Cisco | IOS | affected 12.2(17d)SXB7 | Not specified |
| CNA | Cisco | IOS | affected 12.2(17d)SXB4 | Not specified |
| CNA | Cisco | IOS | affected 12.2(17d)SXB2 | Not specified |
| CNA | Cisco | IOS | affected 12.2(17d)SXB3 | Not specified |
| CNA | Cisco | IOS | affected 12.2(17d)SXB5 | Not specified |
| CNA | Cisco | IOS | affected 12.2(17d)SXB10 | Not specified |
| CNA | Cisco | IOS | affected 12.2(17d)SXB8 | Not specified |
| CNA | Cisco | IOS | affected 12.2(17d)SXB11a | Not specified |
| CNA | Cisco | IOS | affected 12.2(17d)SXB1 | Not specified |
| CNA | Cisco | IOS | affected 12.2(17d)SXB9 | Not specified |
| CNA | Cisco | IOS | affected 12.2(18)SO1 | Not specified |
| CNA | Cisco | IOS | affected 12.2(18)SO3 | Not specified |
| CNA | Cisco | IOS | affected 12.2(18)SO2 | Not specified |
| CNA | Cisco | IOS | affected 12.2(18)SXF | Not specified |
| CNA | Cisco | IOS | affected 12.2(18)SXF5 | Not specified |
| CNA | Cisco | IOS | affected 12.2(18)SXF6 | Not specified |
| CNA | Cisco | IOS | affected 12.2(18)SXF15 | Not specified |
| CNA | Cisco | IOS | affected 12.2(18)SXF10 | Not specified |
| CNA | Cisco | IOS | affected 12.2(18)SXF17b | Not specified |
| CNA | Cisco | IOS | affected 12.2(18)SXF4 | Not specified |
| CNA | Cisco | IOS | affected 12.2(18)SXF15a | Not specified |
| CNA | Cisco | IOS | affected 12.2(18)SXF3 | Not specified |
| CNA | Cisco | IOS | affected 12.2(18)SXF17 | Not specified |
| CNA | Cisco | IOS | affected 12.2(18)SXF12 | Not specified |
| CNA | Cisco | IOS | affected 12.2(18)SXF8 | Not specified |
| CNA | Cisco | IOS | affected 12.2(18)SXF10a | Not specified |
| CNA | Cisco | IOS | affected 12.2(18)SXF16 | Not specified |
| CNA | Cisco | IOS | affected 12.2(18)SXF7 | Not specified |
| CNA | Cisco | IOS | affected 12.2(18)SXF17a | Not specified |
| CNA | Cisco | IOS | affected 12.2(18)SXF14 | Not specified |
| CNA | Cisco | IOS | affected 12.2(18)SXF12a | Not specified |
| CNA | Cisco | IOS | affected 12.2(18)SXF9 | Not specified |
| CNA | Cisco | IOS | affected 12.2(18)SXF13 | Not specified |
| CNA | Cisco | IOS | affected 12.2(18)SXF2 | Not specified |
| CNA | Cisco | IOS | affected 12.2(18)SXF11 | Not specified |
| CNA | Cisco | IOS | affected 12.2(28)ZX | Not specified |
| CNA | Cisco | IOS | affected 12.2(33)STE0 | Not specified |
| CNA | Cisco | IOS | affected 15.0(1)XO1 | Not specified |
| CNA | Cisco | IOS | affected 15.0(1)XO | Not specified |
| CNA | Cisco | IOS | affected 15.0(2)XO | Not specified |
| CNA | Cisco | IOS | affected 15.0(2)SG11a | Not specified |
| CNA | Cisco | IOS | affected 15.0(1)EX | Not specified |
| CNA | Cisco | IOS | affected 15.0(2)EX2 | Not specified |
| CNA | Cisco | IOS | affected 15.0(2)EX8 | Not specified |
| CNA | Cisco | IOS | affected 15.0(2)EX10 | Not specified |
| CNA | Cisco | IOS | affected 15.0(2)EX11 | Not specified |
| CNA | Cisco | IOS | affected 15.0(2)EX13 | Not specified |
| CNA | Cisco | IOS | affected 15.0(2)EX12 | Not specified |
| CNA | Cisco | IOS | affected 15.1(2)SY9 | Not specified |
| CNA | Cisco | IOS | affected 15.1(3)MRA3 | Not specified |
| CNA | Cisco | IOS | affected 15.1(3)MRA4 | Not specified |
| CNA | Cisco | IOS | affected 15.1(3)SVB1 | Not specified |
| CNA | Cisco | IOS | affected 15.1(3)SVB2 | Not specified |
| CNA | Cisco | IOS | affected 15.1(3)SVD | Not specified |
| CNA | Cisco | IOS | affected 15.1(3)SVD1 | Not specified |
| CNA | Cisco | IOS | affected 15.1(3)SVD2 | Not specified |
| CNA | Cisco | IOS | affected 15.1(3)SVF | Not specified |
| CNA | Cisco | IOS | affected 15.1(3)SVF1 | Not specified |
| CNA | Cisco | IOS | affected 15.1(3)SVE | Not specified |
| CNA | Cisco | IOS | affected 15.1(3)SVG | Not specified |
| CNA | Cisco | IOS | affected 15.1(3)SVJ2 | Not specified |
| CNA | IntelliShield | Universal Product | affected N/A | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| Cisco IOS/IOS XE Buffer Overflow in SNMP Service Lets Remote Authenticated Users Execute Arbitrary Code - SecurityTracker | af854a3a-2127-422b-91ae-364da2661108 | www.securitytracker.com | Broken Link, Third Party Advisory, VDB Entry |
| www.cisa.gov/known-exploited-vulnerabilities-catalog | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | www.cisa.gov | US Government Resource |
| sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-201706... | [email protected] | sec.cloudapps.cisco.com | US Government Resource |
| Cisco IOS and IOS XE Software Multiple Remote Code Execution Vulnerabilities | af854a3a-2127-422b-91ae-364da2661108 | www.securityfocus.com | Broken Link, Third Party Advisory, VDB Entry |
| SNMP Remote Code Execution Vulnerabilities in Cisco IOS and IOS XE Software | af854a3a-2127-422b-91ae-364da2661108 | tools.cisco.com | Vendor Advisory |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
| CISA Known Exploited Vulnerabilities catalog | CISA | www.cisa.gov | kev |
No vendor comments have been submitted for this CVE.
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| ADP | 2022-03-03T00:00:00.000Z | CVE-2017-6740 added to CISA KEV |
Exploits
CNA: At the time of initial publication, Cisco was aware of external knowledge of the vulnerabilities described in this advisory and, as a precaution, notified customers about the potential for exploitation. On January 6, 2017, a security researcher published functional exploit code for these vulnerabilities. The Cisco Product Security Incident Response Team (PSIRT) is aware of exploitation of the following vulnerabilities that are described in this advisory: CVE-2017-6736 CVE-2017-6737 CVE-2017-6738 CVE-2017-6739 CVE-2017-6740 CVE-2017-6742 CVE-2017-6743 CVE-2017-6744 The Cisco PSIRT is aware of exploit code available for CVE-2017-6741. Additional information can be found at Cisco TALOS: DNS Hijacking Abuses Trust In Core Internet Service ["https://blog.talosintelligence.com/2019/04/seaturtle.html"].
Legacy QID Mappings
- 590342 Rockwell Automation Allen-Bradley Stratix and ArmorStratix Multiple Vulnerabilities (ICSA-17-208-04)