What is the CVSS score of CVE-2020-3574?

CVE-2020-3574 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 7.9%.

Is there a patch available for CVE-2020-3574?

Yes, a patch is available for CVE-2020-3574. Update the affected software to the latest version immediately.

Ip Phone 8811 Firmware CVE-2020-3574

HIGH

State Issues (CWE-371)

2020-11-06 psirt@cisco.com

Denial Of Service Cisco Ip Phone 8811 Firmware Ip Phone 8841 Firmware Ip Phone 8851 Firmware Ip Phone 8861 Firmware Unified Ip Conference Phone 8831 Firmware Ip Dect 210 Firmware Ip Dect 6825 Firmware Webex Room Phone Firmware

7.5

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-371
Impact	CVSS score of 7.5 (HIGH). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required.
Exploit ScenarioDerived	This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the high-severity affected system.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

Patch available 7.9% exploitation probability (EPSS)

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AnalysisAI

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. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified under CWE-371. 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. Affected products include: Cisco Ip Dect 210 Firmware, Cisco Ip Dect 6825 Firmware, Cisco Ip Phone 8811 Firmware, Cisco Ip Phone 8841 Firmware, Cisco Ip Phone 8851 Firmware.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 7.5 HIGH

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

DescriptionNVD

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.

Threat Intelligence Overview

EPSS Score

7.9%

Top 6% exploitable

Data Quality

2 sources

Confidence: Low

NVD

CVE.org

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC No

EPSS 7.9%

Patch available Yes

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +8

CVSS: +38

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Denial of Service MEDIUM

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.

Affected Products (CPE)NVD

cpe:2.3:o:cisco:ip_dect_210_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:cisco:ip_dect_6825_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:cisco:ip_phone_8811_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:cisco:ip_phone_8841_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:cisco:ip_phone_8851_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:cisco:ip_phone_8861_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:cisco:unified_ip_conference_phone_8831_firmware:9.3\(4\):servicerelease3:*:*:*:*:*:*

cpe:2.3:o:cisco:webex_room_phone_firmware:*:*:*:*:*:*:*:*

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CVE-2011-0611 HIGH POC

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References

Advisories & patches

PATCH https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-voip-phone-flood-dos-YnU9EXOv

Search Externally

GitHub PoC

Exploit-DB PacketStorm Snyk Rapid7 Nuclei Templates Trickest PoC

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