What it is
CVE-2017-6743 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-2017-6743
IOS
Cisco / IOS · 12.1(3)XI
- Severity
- CVSS 8.8 · High
- Confidence
- Confirmed
- Exploit status
- Exploited in the wild
- EPSS
- 10.5%
- First observed
- —
- Last observed
- —
Decision summary
What security teams need to know first
Direct answers before the deeper technical record.
Is it exploited?
Yes. KEV Intelligence tracks this CVE as a known exploited vulnerability. Confidence is confirmed.
Who is affected?
Cisco, IntelliShield / IOS 12.1(3)xi.
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
IOS
15.1(1)T5
Affected
Cisco
IOS
15.1(1)XB
Affected
Cisco
IOS
15.0(1)XO1
Affected
Cisco
IOS
15.0(1)XO
Affected
Cisco
IOS
15.0(2)XO
Affected
Cisco
IOS
12.2(33)MRA
Affected
Cisco
IOS
12.2(33)MRB5
Affected
Cisco
IOS
12.2(33)MRB2
Affected
Cisco
IOS
12.2(33)MRB1
Affected
Cisco
IOS
12.2(33)MRB4
Affected
Cisco
IOS
12.2(33)MRB
Affected
Cisco
IOS
12.2(33)MRB3
Affected
Cisco
IOS
12.2(33)MRB6
Affected
Cisco
IOS
15.3(1)T
Affected
Cisco
IOS
15.3(2)T
Affected
Cisco
IOS
15.3(1)T1
Affected
Cisco
IOS
15.3(1)T2
Affected
Cisco
IOS
15.3(1)T3
Affected
Cisco
IOS
15.3(1)T4
Affected
Cisco
IOS
15.3(2)T1
Affected
Cisco
IOS
15.3(2)T2
Affected
Cisco
IOS
15.3(2)T3
Affected
Cisco
IOS
15.3(2)T4
Affected
Cisco
IOS
12.4(10b)JDE
Affected
Cisco
IOS
15.0(1)EY
Affected
- Published
- 17 Jul 2017
- Exploitation Reported
- 03 Mar 2022
- Attack vector
- Remote
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
Tags
edge
ios
cisa
CVE References
- CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2017-6743
- cisco-sa-20170629-snmp sec.cloudapps.cisco.com · CVE Record https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurity...
Exploitation evidence
Why KEV Intelligence 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
Independent exploitation attestation added to the KEV Intelligence record.
Known exploited vulnerability sources
Per-source evidence links for KEV attestations are available through the KEV Intelligence 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
- 0
- User-Agents
- 0
Raw values available in Pro and Enterprise.
Scanner coverage
No scanner integrations recorded yet.
Virtual patch status
No KEV Intelligence 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
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS
10.5%
Timeline
From disclosure to observed exploitation
-
Added to CISA KEV
Listed in the CISA Known Exploited Vulnerabilities catalog
-
CVE published
Vulnerability disclosed publicly
-
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-2017-6743
Free JSON includes basic KEV fields{
"cve_id": "CVE-2017-6743",
"confidence": "Confirmed",
"cvss_score": 8.8,
"cvss_estimated": false,
"epss_score": 0.1055,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "attempts": 0, "sensors": 0 }
}Early warning alerts
Get alerts on high-impact exploitation
Receive curator-selected alerts when exploitation activity warrants attention. Each alert includes the evidence and context needed to decide what requires attention now.