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TI-2021-17308 Aliases CVE-2021-40113GHSA-gf95-pcww-8h2h

Cisco Catalyst PON Series Switches Optical Network Terminal Vulnerabilities

Priority MEDIUM 56CWE-284Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-284 and CWE-78.

Summary

Multiple vulnerabilities in the web-based management interface of the Cisco Catalyst Passive Optical Network (PON) Series Switches Optical Network Terminal (ONT) could allow an unauthenticated, remote attacker to perform the following actions: Log in with a default credential if the Telnet protocol is enabled Perform command injection Modify the configuration For more information about these vulnerabilities, see the Details section of this advisory.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0463 91st 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
None
Automatable
Yes
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
CiscoCisco Catalyst PON Seriesall versions—No fix listedCNA
  • Cisco Catalyst PON Series VendorCisco Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 10

CPEVersionsRoleVendor
cpe:2.3:o:cisco:catalyst_pon_switch_cgp-ont-1p_firmware:*:*:*:*:*:*:*:*before 1.1.1.14VulnerableCisco
cpe:2.3:h:cisco:catalyst_pon_switch_cgp-ont-1p:*:*:*:*:*:*:*:*all versionsRunning onCisco
cpe:2.3:o:cisco:catalyst_pon_switch_cgp-ont-4p_firmware:*:*:*:*:*:*:*:*before 1.1.3.17VulnerableCisco
cpe:2.3:h:cisco:catalyst_pon_switch_cgp-ont-4p:*:*:*:*:*:*:*:*all versionsRunning onCisco
cpe:2.3:o:cisco:catalyst_pon_switch_cgp-ont-4pvc_firmware:*:*:*:*:*:*:*:*before 1.1.3.17VulnerableCisco
cpe:2.3:h:cisco:catalyst_pon_switch_cgp-ont-4pvc:*:*:*:*:*:*:*:*all versionsRunning onCisco
cpe:2.3:o:cisco:catalyst_pon_switch_cgp-ont-4tvcw_firmware:*:*:*:*:*:*:*:*before 1.1.3.17VulnerableCisco
cpe:2.3:h:cisco:catalyst_pon_switch_cgp-ont-4tvcw:*:*:*:*:*:*:*:*all versionsRunning onCisco
cpe:2.3:o:cisco:catalyst_pon_switch_cgp-ont-4pv_firmware:*:*:*:*:*:*:*:*before 1.1.3.17VulnerableCisco
cpe:2.3:h:cisco:catalyst_pon_switch_cgp-ont-4pv:*:*:*:*:*:*:*:*all versionsRunning onCisco
  • cpe:2.3:o:cisco:catalyst_pon_switch_cgp-ont-1p_firmware:*:*:*:*:*:*:*:* Versions before 1.1.1.14 Vulnerable ·Cisco
  • cpe:2.3:h:cisco:catalyst_pon_switch_cgp-ont-1p:*:*:*:*:*:*:*:* Versions all versions Running on ·Cisco
  • cpe:2.3:o:cisco:catalyst_pon_switch_cgp-ont-4p_firmware:*:*:*:*:*:*:*:* Versions before 1.1.3.17 Vulnerable ·Cisco
  • cpe:2.3:h:cisco:catalyst_pon_switch_cgp-ont-4p:*:*:*:*:*:*:*:* Versions all versions Running on ·Cisco
  • cpe:2.3:o:cisco:catalyst_pon_switch_cgp-ont-4pvc_firmware:*:*:*:*:*:*:*:* Versions before 1.1.3.17 Vulnerable ·Cisco
  • cpe:2.3:h:cisco:catalyst_pon_switch_cgp-ont-4pvc:*:*:*:*:*:*:*:* Versions all versions Running on ·Cisco
  • cpe:2.3:o:cisco:catalyst_pon_switch_cgp-ont-4tvcw_firmware:*:*:*:*:*:*:*:* Versions before 1.1.3.17 Vulnerable ·Cisco
  • cpe:2.3:h:cisco:catalyst_pon_switch_cgp-ont-4tvcw:*:*:*:*:*:*:*:* Versions all versions Running on ·Cisco
  • cpe:2.3:o:cisco:catalyst_pon_switch_cgp-ont-4pv_firmware:*:*:*:*:*:*:*:* Versions before 1.1.3.17 Vulnerable ·Cisco
  • cpe:2.3:h:cisco:catalyst_pon_switch_cgp-ont-4pv:*:*:*:*:*:*:*:* Versions all versions Running on ·Cisco

Remediation

No fixed version listed by the sources yet.

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    Cisco Catalyst PON Series — 20211103 Cisco Catalyst PON Series Switches Optical Network Terminal Vulnerabilities

    3 records Highest priority Priority MEDIUM 3 MEDIUM

    Other records, highest priority first

    • TI-2021-17307 Cisco Catalyst PON Series Switches Optical Network Terminal VulnerabilitiesPriority MEDIUM 52
    • TI-2021-13793 Cisco Catalyst PON Series Switches Optical Network Terminal VulnerabilitiesPriority MEDIUM 52
    Show all 3 records → Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-40113
  2. 2026-10-03 Alias added: GHSA-gf95-pcww-8h2h

References

Patch 1

  • TI-2021-17307 Cisco Catalyst PON Series Switches Optical Network Terminal Vulnerabilities CVSS 3.1CRITICAL 10.0
  • TI-2021-13793 Cisco Catalyst PON Series Switches Optical Network Terminal Vulnerabilities CVSS 3.1CRITICAL 10.0

Sources

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