CVE-2021-34795 json
Cisco Catalyst PON Series Switches Optical Network Terminal Vulnerabilities
published 2021-11-04 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-21445
- cvss
- 10.0
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.7%
- EPSS 1.7% chance of exploitation in 30 days, percentile 77%
- public exploits
- 0
- none known
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.
Patch / fix
- cisco catalyst_pon_switch_cgp-ont-1p_firmware 1.1.1.14
- cisco catalyst_pon_switch_cgp-ont-4p_firmware 1.1.3.17
- cisco catalyst_pon_switch_cgp-ont-4pvc_firmware 1.1.3.17
- cisco catalyst_pon_switch_cgp-ont-4tvcw_firmware 1.1.3.17
- cisco catalyst_pon_switch_cgp-ont-4pv_firmware 1.1.3.17
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- total
- Assessed
- 2 y ago
Exploit prediction
1.75% chance of exploitation in the next 30 days, higher than 77% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 10.0 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
Affected products
- Cisco Cisco Catalyst PON Series
Classification
References
Sources
- CVE List CVE-2021-34795
- NVD CVE-2021-34795
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.