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vulnerability / NVI-00000401 / Revision 4

CVE-2017-6736

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.

source listedactiveCVE-2017-6736

This report has not inspected your inventory, configuration, deployed build, reachability or evidence. A catalog listing and a severity score do not establish exposure or compromise.

01 / Meaning

Why it matters

Published affected context helps an owner decide what evidence to gather. This report has not examined your application.

CVSS

8.8 HIGH (3.0)

cisco severity and vector CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H; not a measure of customer compromise.

As of · CVE Program / attributed CNA and ADP

CISA KEV

Listed

CISA lists known exploitation. This does not establish exploitation of your system.

As of · CISA

EPSS

70.354%

FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.99385. Missing scores are unknown.

As of · FIRST EPSS

02 / Applicability

The affected context

Affected versions, configuration prerequisites and known exclusions are public. Confirm each one against the deployed service.

IOS

source listed
  • 12.1(3a)XI9
  • 12.1(3)XI
  • 12.1(3a)XI8
  • 12.1(3a)XI3
  • 12.1(3a)XI1
  • 12.1(3a)XI7
  • 12.1(3a)XI6
  • 12.1(3a)XI4
  • 12.1(3a)XI2
  • 12.1(3a)XI5
  • 12.0(5)S
  • 12.0(11)S6
  • 12.0(10)S
  • 12.0(11)S5
  • 12.0(2)S
  • 12.0(4)S
  • 12.0(6)S2
  • 12.0(7)S
  • 12.0(6)S
  • 12.0(6)S1
  • 12.0(11)S4
  • 12.0(10)S1
  • 12.0(10)S7
  • 12.0(11)S3
  • 12.0(14)S4
  • 12.0(14)S6
  • 12.0(12)S1
  • 12.0(15)S2
  • 12.0(10)S3
  • 12.0(8)S
  • 12.0(10)S3b
  • 12.0(8)S1
  • 12.0(10)S4
  • 12.0(3)S
  • 12.0(10)S2
  • 12.0(11)S1
  • 12.0(10)S8
  • 12.0(9)S
  • 12.0(9)S8
  • 12.0(13)S4
  • 12.0(15)S5
  • 12.0(13)S3
  • 12.0(10)S5
  • 12.0(10)S6
  • 12.0(7)S1
  • 12.0(12)S2
  • 12.0(11)S
  • 12.0(11)S2
  • 12.0(14)S5
  • 12.2(4)B
  • 12.2(15)B
  • 12.2(16)B1
  • 12.2(4)B7
  • 12.2(4)B2
  • 12.2(16)B2
  • 12.2(4)B6
  • 12.2(4)B1
  • 12.2(4)B4
  • 12.2(4)B3
  • 12.2(4)B8
  • 12.2(4)B5
  • 12.2(16)B
  • 12.2(14)S
  • 12.2(20)S
  • 12.2(18)S
  • 12.2(14)S16
  • 12.2(25)S
  • 12.2(9)S
  • 12.2(20)S10
  • 12.2(20)S8
  • 12.2(14)S7
  • 12.2(14)S11
  • 12.2(25)S12
  • 12.2(25)S4
  • 12.2(14)S18
  • 12.2(18)S8
  • 12.2(18)S10
  • 12.2(25)S15
  • 12.2(20)S5
  • 12.2(25)S7
  • 12.2(18)S7
  • 12.2(25)S14
  • 12.2(14)S10
  • 12.2(25)S11
  • 12.2(14)S13
  • 12.2(18)S1
  • 12.2(18)S11
  • 12.2(18)S5
  • 12.2(20)S4
  • 12.2(25)S10
  • 12.2(20)S7
  • 12.2(18)S2
  • 12.2(25)S5
  • 12.2(14)S17
  • 12.2(18)S9
  • 12.2(14)S3
  • 12.2(18)S6
  • 12.2(18)S12
  • 12.2(25)S13
  • 12.2(18)S4

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 informati

CVE Program / attributed CNA and ADP

Universal Product

source listed
  • N/A

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 informati

CVE Program / attributed CNA and ADP

Cisco IOS and IOS XE Software

source listed

The linked source does not supply a complete affected-version range here.

CISA does not supply a complete application-specific affected range here. Follow the linked vendor advisory for version and configuration prerequisites.

CISA

03 / Response

What to do next

  1. investigate

    Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.

    Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system. FIRST EPSS

  2. investigate

    Apply updates per vendor instructions.

    Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system. CISA

A fixed release is not deployment evidence.

Check current vendor support and compatibility. After making a change, verify the deployed build and relevant runtime conditions. Keep the evidence, owner and time. An updated lockfile alone does not prove what is running.

04 / Limits

What this report cannot establish

  • Customer inventory, deployment, reachability and exploitation have not been inspected.
  • CISA catalog date-added and due-date fields are not the original vulnerability disclosure date or universal legal deadlines.
  • NVD lastModified does not establish freshness of every associated CPE record.
Read the collection and interpretation limits ↗

05 / Provenance

Sources you can inspect

Each assertion retains its source. Mirrored records may repeat one underlying publisher; additional links are not independent corroboration.

  1. CVE-2017-6736 ↗

    CVE Program / attributed CNA and ADP · cna record

    Observed . CVE content: copyright The MITRE Corporation; CVE Terms of Use and license apply. CNA and ADP publishers retain separate attribution.

  2. CVE-2017-6736 ↗

    CISA · official catalog

    Observed . CISA KEV; CC0 1.0. Catalog assertions are not evidence of customer compromise.

  3. CVE-2017-6736 ↗

    NIST National Vulnerability Database · official catalog

    Observed . This product uses data from the NVD API but is not endorsed or certified by the NVD.

  4. CVE-2017-6736 ↗

    FIRST EPSS · official catalog

    Observed . FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.

Public revision history

Only published revisions appear here. Routine fetches do not create a material-change event.

  1. Revision 4 ·

    Source facts changed; compare the preserved prior revision.

  2. Revision 3 ·

    Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.

  3. Revision 1 ·

    First indexed by Null; source disclosure date is shown separately.

Read the public revision data ↗

The next step is private

Bring the question into your environment.

The connected workflow is a development preview for inventory, contextual matching, owner decisions and evidence-based verification. No system-specific result is generated by this page.

See the synthetic workflow preview ↗