What it is
CVE-2017-6740 is a vulnerability affecting Cisco, IntelliShield IOS, Universal Product. The Simple Network Management Protocol (SNMP) subsystem of Cisco IOS and IOS XE Software contains multiple vulnerabilities that...
Vulnerability report
Exploited in the wild
Confirmed confidence
In CISA KEV
CVE-2017-6740
IOS
Cisco, IntelliShield / IOS · 12.2(14)ZA
- Severity
- CVSS 8.8 · High
- Confidence
- Confirmed
- Exploit status
- Exploited in the wild
- EPSS
- 11.1%
- First observed
- —
- Last observed
- —
Decision summary
What security teams need to know first
Direct answers before the deeper technical record.
Is it exploited?
Yes. Previdian tracks this CVE as a known exploited vulnerability. Confidence is confirmed. Listed in CISA KEV.
Who is affected?
Cisco, IntelliShield / IOS 12.2(14)za.
What should we do?
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
Overview
IOS
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.
Vendor
Product
Affected
Status
Cisco
Affected
IOS
12.2(14)ZA
12.2(14)ZA3
12.2(14)ZA2
12.2(14)ZA5
12.2(14)ZA4
12.2(14)ZA6
12.2(14)ZA7
12.2(25)SE2
12.2(29)SV2
12.2(17d)SXB6
12.2(17d)SXB11
12.2(17d)SXB7
12.2(17d)SXB4
12.2(17d)SXB2
12.2(17d)SXB3
12.2(17d)SXB5
12.2(17d)SXB10
12.2(17d)SXB8
12.2(17d)SXB11a
12.2(17d)SXB1
12.2(17d)SXB9
12.2(18)SO1
12.2(18)SO3
12.2(18)SO2
12.2(18)SXF
12.2(18)SXF5
12.2(18)SXF6
12.2(18)SXF15
12.2(18)SXF10
12.2(18)SXF17b
12.2(18)SXF4
12.2(18)SXF15a
12.2(18)SXF3
12.2(18)SXF17
12.2(18)SXF12
12.2(18)SXF8
12.2(18)SXF10a
12.2(18)SXF16
12.2(18)SXF7
12.2(18)SXF17a
12.2(18)SXF14
12.2(18)SXF12a
12.2(18)SXF9
12.2(18)SXF13
12.2(18)SXF2
12.2(18)SXF11
12.2(28)ZX
12.2(33)STE0
15.0(1)XO1
15.0(1)XO
15.0(2)XO
15.0(2)SG11a
15.0(1)EX
15.0(2)EX2
15.0(2)EX8
15.0(2)EX10
15.0(2)EX11
15.0(2)EX13
15.0(2)EX12
15.1(2)SY9
15.1(3)MRA3
15.1(3)MRA4
15.1(3)SVB1
15.1(3)SVB2
15.1(3)SVD
15.1(3)SVD1
15.1(3)SVD2
15.1(3)SVF
15.1(3)SVF1
15.1(3)SVE
15.1(3)SVG
15.1(3)SVJ2
Affected
- Published
- 17 Jul 2017
- Exploitation Reported
- 03 Mar 2022
- Attack vector
- Remote
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
Tags
ios
cisa
edge
CVE References
- CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2017-6740
- cisco-sa-20170629-snmp sec.cloudapps.cisco.com · CVE Record https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurity...
Exploitation evidence
Why Previdian marks this CVE as exploited
Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.
Exploited in the wild
CISA
A trusted third party reported exploitation.
Known exploited vulnerability sources
Per-source evidence links for KEV attestations are available through the Previdian Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| CISA First | 2022-03-03 00:00 UTC |
Detection
Operational artifacts and observed signals
Make the evidence actionable in scanner, SOC, and edge-control workflows.
Observed signals
- Request targets
- User-Agents
- Callback hosts
- 0
- 0
- 0
Request targets and User-Agents available in Pro. Callback host details available in Enterprise.
Scanner coverage
No scanner integrations recorded yet.
Virtual patch status
No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.
Learn about virtual patches →No detection artifacts or sensor request patterns are available for this CVE yet.
Check back as sensor telemetry and scanner integrations are updated.
Risk and context
Severity, weaknesses, and research context
CVSS v3.0
8.8
High
Potential damage if exploited. Separate from whether attackers are using it.
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS
11.1%
Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.
Timeline
From disclosure to observed exploitation
-
00:00 UTC
Added to CISA KEV
Listed in the CISA Known Exploited Vulnerabilities catalog
-
21:00 UTC
CVE published
Vulnerability disclosed publicly
-
00:00 UTC
CVE ID reserved
Identifier reserved by the CNA
Pro API
Automate this intelligence
Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
- Evidence confidence and provenance
- First-party sensor telemetry
- PoC and scanner references
- Affected versions and enrichment
- Automation-ready JSON delivery
GET /api/v2/pro/kevs/CVE-2017-6740
Sample API response{
"cve_id": "CVE-2017-6740",
"confidence": "Confirmed",
"cvss_score": 8.8,
"cvss_estimated": false,
"epss_score": 0.111,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "attempts": 0, "sensors": 0 }
}