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CISA KEV · Known exploitedHigh

CVE-2017-6737

Cisco IOS and IOS XE Software

A vulnerability in the SNMP implementation of could allow an authenticated, remote attacker to cause a reload of the affected system or to remotely execute code. An attacker could exploit this vulnerability by sending a crafted SNMP packet to the affected device.  The vulnerability is due to a buffer overflow in the affected code area. The vulnerability affects all versions of SNMP (versions 1, 2c, and 3). The attacker must know the SNMP read only community string (SNMP version 2c or earlier) or the user credentials (SNMPv3). An exploit could allow the attacker to execute arbitrary cod...

CVSS
8.8
EPSS
42.6%
98.6% percentile
CISA KEV
Listed
Published
2017.07.18
PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV
Exploit probability42.6%
Technical severityCVSS 8.8

Vulnerability overview

A vulnerability in the SNMP implementation of could allow an authenticated, remote attacker to cause a reload of the affected system or to remotely execute code. An attacker could exploit this vulnerability by sending a crafted SNMP packet to the affected device.  The vulnerability is due to a buffer overflow in the affected code area. The vulnerability affects all versions of SNMP (versions 1, 2c, and 3). The attacker must know the SNMP read only community string (SNMP version 2c or earlier) or the user credentials (SNMPv3). An exploit could allow the attacker to execute arbitrary cod...

Affected product and versions

Product
Cisco IOS and IOS XE Software
Affected versions
12.1(3)XI, 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(2)XA, 12.2(2)XA2, 12.2(2)XA3, 12.2(2)XA4, 12.2(2)XA5, 12.2(2)XA1
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
CISA required action

Apply updates per vendor instructions.

Due date: 2022.03.24
  1. 1
    Identify

    Confirm that Cisco IOS and IOS XE Software and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-119
KEV added
2022.03.03
Ransomware use
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