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CVE-2019-12654

Cisco IOS and IOS XE Software Session Initiation Protocol Denial of Service Vulnerability

HIGH
7.5
CVSS Score
Published: September 25, 2019 at 08:16 PM UTC
Updated: June 17, 2026 at 02:15 AM UTC
17 products affected across 1 vendorIOS XeAsr 1002-xAsr 1001-X

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Severity
HIGH7.5
Exploit prediction
EPSS 2%
SSVC
No known exploit

Description

A vulnerability in the common Session Initiation Protocol (SIP) library of Cisco IOS and IOS XE Software could allow an unauthenticated, remote attacker to trigger a reload of an affected device, resulting in a denial of service (DoS) condition. The vulnerability is due to insufficient sanity checks on an internal data structure. An attacker could exploit this vulnerability by sending a sequence of malicious SIP messages to an affected device. An exploit could allow the attacker to cause a NULL pointer dereference, resulting in a crash of the iosd process. This triggers a reload of the device.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

IOS Xe· Cisco
95%
15.6(1)s4.216.3.816.9.1
cisco-1000-integrated-services-router (environment) · cisco-1100-integrated-services-router (environment) · cisco-4000-integrated-services-router (environment) · cisco-4221-integrated-services-router (environment) · cisco-4321-integrated-services-router (environment) · cisco-4331-integrated-services-router (environment) · cisco-4351-integrated-services-router (environment) · cisco-4431-integrated-services-router (environment) · cisco-4451-x-integrated-services-router (environment) · cisco-asr-1000 (environment) · cisco-asr-1001-hx (environment) · cisco-asr-1001-x (environment) · cisco-asr-1002-hx (environment) · cisco-asr-1002-x (environment) · cisco-cloud-services-router-1000v (environment) · cisco-integrated-services-virtual-router (environment)
1000 Integrated Services Router· Ciscodevice
80%
All versions
1100 Integrated Services Router· Ciscodevice
80%
All versions
4000 Integrated Services Router· Ciscodevice
80%
All versions
4221 Integrated Services Router· Ciscodevice
80%
All versions
4321 Integrated Services Router· Ciscodevice
80%
All versions
4331 Integrated Services Router· Ciscodevice
80%
All versions
4351 Integrated Services Router· Ciscodevice
80%
All versions
4431 Integrated Services Router· Ciscodevice
80%
All versions
4451-X Integrated Services Router· Ciscodevice
80%
All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisoryx_refsource_CISCO
Source: [email protected]
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190925-sip-dos

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-476

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