A vulnerability in web-based management interface of Cisco SPA500 Series Analog Telephone Adapters (ATAs) could allow an authenticated, remote attacker to to modify a web page in the context of a user's browser. This vulnerability is due to insufficient validation of user-supplied input by the web-based management interface of the affected software. An attacker could exploit this vulnerability by persuading a user to click a crafted link. A successful exploit could allow the attacker to alter the contents of a web page to redirect the user to potentially malicious websites, or the attacker could use this vulnerability to conduct further client-side attacks. Cisco will not release software updates that address this vulnerability. {{value}} ["%7b%7bvalue%7d%7d"])}]]
Conclusion & alert: CVE-2023-20218 is rated Low Risk (33.4/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.37%). Mandatory action: Monitor for updates and reassess as exploit intelligence or EPSS changes.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-06-15 | 0.10% | 0.37% | +0.27% |
| 2 | 2025-11-21 | 0.17% | 0.10% | -0.07% |
| 3 | 2025-11-18 | — | 0.17% | — |
Full EPSS history (5 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 5.8 | 3.1 | MEDIUM |
|
3.9 | 1.4 | [email protected] |
| 6.1 | 3.1 | MEDIUM |
|
2.8 | 2.7 | [email protected] |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| cisco | spa500ds_firmware | — | cpe:2.3:o:cisco:spa500ds_firmware:-:*:*:*:*:*:*:* |
| cisco | spa500s_firmware | — | cpe:2.3:o:cisco:spa500s_firmware:-:*:*:*:*:*:*:* |
| cisco | spa501g_firmware | — | cpe:2.3:o:cisco:spa501g_firmware:-:*:*:*:*:*:*:* |
| cisco | spa502g_firmware | — | cpe:2.3:o:cisco:spa502g_firmware:-:*:*:*:*:*:*:* |
| cisco | spa504g_firmware | — | cpe:2.3:o:cisco:spa504g_firmware:-:*:*:*:*:*:*:* |
| cisco | spa508g_firmware | — | cpe:2.3:o:cisco:spa508g_firmware:-:*:*:*:*:*:*:* |
| cisco | spa509g_firmware | — | cpe:2.3:o:cisco:spa509g_firmware:-:*:*:*:*:*:*:* |
| cisco | spa512g_firmware | — | cpe:2.3:o:cisco:spa512g_firmware:-:*:*:*:*:*:*:* |
| cisco | spa514g_firmware | — | cpe:2.3:o:cisco:spa514g_firmware:-:*:*:*:*:*:*:* |
| cisco | spa525_firmware | — | cpe:2.3:o:cisco:spa525_firmware:-:*:*:*:*:*:*:* |
| cisco | spa525g_firmware | — | cpe:2.3:o:cisco:spa525g_firmware:-:*:*:*:*:*:*:* |
| cisco | spa525g2_firmware | — | cpe:2.3:o:cisco:spa525g2_firmware:-:*:*:*:*:*:*:* |