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CISA KEV · Known exploitedHigh

CVE-2017-6740

Cisco IOS and IOS XE Software

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...

CVSS
8.8
EPSS
10.8%
95.4% 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 probability10.8%
Technical severityCVSS 8.8

Vulnerability overview

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...

Affected product and versions

Product
Cisco IOS and IOS XE Software
Affected versions
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
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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