CVE-2020-3574

7.5 HIGH 8% exploit odds Fix listed Denial of service Device

What it is

A vulnerability in the TCP packet processing functionality of Cisco IP Phones could allow an unauthenticated, remote attacker to cause the phone to stop responding to incoming calls, drop connected calls, or unexpectedly reload. The vulnerability is due to insufficient TCP ingress packet rate limiting. An attacker could exploit this vulnerability by sending a high and sustained rate of crafted TCP traffic to the targeted device. A successful exploit could allow the attacker to impact operations of the phone or cause the phone to reload, leading to a denial of service (DoS) condition.

At a glance

Exploitability: Can be exploited over the network without logging in. High risk of service disruption.
Exploit odds: 8.0% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2020-11-06 19:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 03:18 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 8.0% in the next 30 days (EPSS).
Severity: 7.5 HIGH (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2020-11-06 19:15 UTC
Last modified: 2026-06-17 03:18 UTC
Exploit probability: 8.0% · EPSS, next 30 days
Weakness: CWE-371
Record status: Modified

Affected

Cisco Ip Dect 210 Firmware < 4.8.1
Cisco Ip Dect 6825 Firmware < 4.8.1
Cisco Ip Phone 8811 Firmware < 11.3.2
Cisco Ip Phone 8841 Firmware < 11.3.2
Cisco Ip Phone 8851 Firmware < 11.3.2
Cisco Ip Phone 8861 Firmware < 11.3.2
Cisco Unified Ip Conference Phone 8831 Firmware 9.3\(4\)
Cisco Webex Room Phone Firmware < 1.2.0

Attack profile CVSS 3.1 · 7.5

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: High

Raw vector

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

Is it in your code?

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Fix and advisories

References

NVD record · CVE.org record