Vulnerability record · CVE-2023-20126 · published 4 May 2023

CVE-2023-20126: Cisco spa112 firmware missing authentication for critical function vulnerability

Cisco · Spa112 Firmware

A vulnerability in the web-based management interface of Cisco SPA112 2-Port Phone Adapters could allow an unauthenticated, remote attacker to execute arbitrary code on an affected device. This vulnerability is due to a missing authentication process within the firmware upgrade function. An attacker could exploit this vulnerability by upgrading an affected device to a crafted version of firmware. A successful exploit could allow the attacker to execute arbitrary code on the affected device with full privileges. Cisco has not released firmware updates to address this vulnerability.

9.8 CVSS 3.1 Critical EPSS 37% · top 1.5% CWE-306 · Missing authentication for critical function

9.8CVSS 3.1 base score

37%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

2References

17 Jun 2026Last modified by NVD

Description

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

Spa112 Firmware Cisco

References

Link	Tags
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-spa-unauth-upgrade-UqhyTWW	Vendor Advisory
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-spa-unauth-upgrade-UqhyTWW	Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.0CVE-2019-15249Cisco spa112 firmware memory buffer overflow vulnerabilityMultiple vulnerabilities in Cisco SPA100 Series Analog Telephone Adapters (ATAs) could allow an authenticated, adjacent attacker to execute arbitrary…EPSS 0.58%16 Oct 2019 8.0CVE-2019-15250Cisco spa112 firmware memory buffer overflow vulnerabilityMultiple vulnerabilities in Cisco SPA100 Series Analog Telephone Adapters (ATAs) could allow an authenticated, adjacent attacker to execute arbitrary…EPSS 0.58%16 Oct 2019 8.0CVE-2019-15251Cisco spa112 firmware memory buffer overflow vulnerabilityMultiple vulnerabilities in Cisco SPA100 Series Analog Telephone Adapters (ATAs) could allow an authenticated, adjacent attacker to execute arbitrary…EPSS 0.58%16 Oct 2019 8.0CVE-2019-15252Cisco spa112 firmware memory buffer overflow vulnerabilityMultiple vulnerabilities in Cisco SPA100 Series Analog Telephone Adapters (ATAs) could allow an authenticated, adjacent attacker to execute arbitrary…EPSS 0.58%16 Oct 2019 8.0CVE-2019-15240Cisco spa112 firmware memory buffer overflow vulnerabilityMultiple vulnerabilities in Cisco SPA100 Series Analog Telephone Adapters (ATAs) could allow an authenticated, adjacent attacker to execute arbitrary…EPSS 0.58%16 Oct 2019 8.0CVE-2019-15241Cisco spa112 firmware memory buffer overflow vulnerabilityMultiple vulnerabilities in Cisco SPA100 Series Analog Telephone Adapters (ATAs) could allow an authenticated, adjacent attacker to execute arbitrary…EPSS 0.58%16 Oct 2019 8.0CVE-2019-15242Cisco spa112 firmware memory buffer overflow vulnerabilityMultiple vulnerabilities in Cisco SPA100 Series Analog Telephone Adapters (ATAs) could allow an authenticated, adjacent attacker to execute arbitrary…EPSS 0.58%16 Oct 2019 8.0CVE-2019-15243Cisco spa112 firmware memory buffer overflow vulnerabilityMultiple vulnerabilities in Cisco SPA100 Series Analog Telephone Adapters (ATAs) could allow an authenticated, adjacent attacker to execute arbitrary…EPSS 0.58%16 Oct 2019

Source: NIST National Vulnerability Database (record CVE-2023-20126), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.