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TI-2017-04495 Aliases CVE-2017-6740GHSA-vmp6-vfp8-8398

Memory corruption in Cisco IOS

Priority CRITICAL 97Exploited in the wildCWE-119Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-119 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation Active In CISA KEV since 2022-03-03CISA due date 2022-03-24
EPSS 0.111 95th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Active
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
CiscoIOS12.2(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—No fix listedCNA
CiscoUniversal ProductN/A—No fix listedCNA
  • IOS VendorCisco Affected 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 Fixed in — No fix listed CNA
  • Universal Product VendorCisco Affected N/A Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:o:cisco:ios:*:*:*:*:*:*:*:*12.0 – 12.4; 15.0 – 15.6VulnerableCisco
cpe:2.3:o:cisco:ios_xe:*:*:*:*:*:*:*:*2.2.0 – 3.17VulnerableCisco
  • cpe:2.3:o:cisco:ios:*:*:*:*:*:*:*:* Versions 12.0 – 12.4; 15.0 – 15.6 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:*:*:*:*:*:*:*:* Versions 2.2.0 – 3.17 Vulnerable ·Cisco

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2022-03-03 Added to CISA KEV
  2. 2026-10-02 Threatist record created from CVE-2017-6740
  3. 2026-10-03 Alias added: GHSA-vmp6-vfp8-8398

References

Advisory 1

Other 1

  • TI-2018-00138 Improper input validation in Cisco IOS and IOS XE KEVCVSS 3.1CRITICAL 9.8
  • TI-2017-09019 Improper input validation in Cisco IOS and IOS XE KEVCVSS 3.1CRITICAL 9.8
  • TI-2017-02977 Improper input validation in Cisco IOS and IOS XE Software KEVCVSS 3.1CRITICAL 9.8
  • TI-2018-00135 Memory corruption in Cisco IOS, IOS XE, and IOS XR KEVCVSS 3.1HIGH 8.8
  • TI-2017-04499 Memory corruption in Cisco IOS KEVCVSS 3.1HIGH 8.8
  • TI-2017-04498 Memory corruption in Cisco IOS KEVCVSS 3.1HIGH 8.8
See all 617 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences