CVE-2024-20436

HIGH
7.5
CVSS Score
Published: September 25, 2024 at 04:26 PM UTC
Updated: June 17, 2026 at 07:07 AM UTC
1 product affected across 1 vendorIOS Xe

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Severity
HIGH7.5
Exploit prediction
EPSS 0.9%
SSVC
No known exploit

Description

A vulnerability in the HTTP Server feature of Cisco IOS XE Software when the Telephony Service feature is enabled could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to a null pointer dereference when accessing specific URLs. An attacker could exploit this vulnerability by sending crafted HTTP traffic to an affected device. A successful exploit could allow the attacker to cause the affected device to reload, causing a DoS condition on the affected device.

Affected

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

16.10.116.10.1a16.10.1b16.10.1e16.10.1s16.10.216.10.316.11.116.11.1a16.11.1b16.11.1s16.11.216.12.116.12.1a16.12.1c16.12.1s16.12.216.12.2s16.12.316.12.3s16.12.416.12.4a16.12.516.12.616.12.716.12.816.2.116.2.216.3.116.3.1016.3.1116.3.1a16.3.216.3.316.3.416.3.516.3.616.3.716.3.816.3.916.4.116.4.216.4.316.5.116.5.1b16.5.216.5.316.6.116.6.1016.6.216.6.316.6.416.6.516.6.616.6.716.6.816.6.916.7.116.7.216.7.316.8.116.8.1s16.8.216.8.316.9.116.9.1s16.9.216.9.316.9.416.9.516.9.616.9.716.9.817.1.117.1.1s17.1.1t17.1.317.10.117.10.1a17.10.1b17.11.117.11.1a17.12.117.12.1a17.2.117.2.1r17.2.1v17.2.217.2.317.3.117.3.1a17.3.217.3.317.3.417.3.4a17.3.517.3.617.3.717.3.817.3.8a17.4.117.4.1a17.4.1b17.4.217.5.117.5.1a17.6.117.6.1a17.6.217.6.317.6.3a17.6.417.6.517.6.5a17.6.617.6.6a17.7.117.7.1a17.7.217.8.117.8.1a17.9.117.9.1a17.9.217.9.2a17.9.317.9.3a17.9.417.9.4a3.10.0S3.10.0s3.10.10S3.10.10s3.10.1S3.10.1s3.10.2S3.10.2s3.10.2tS3.10.2ts3.10.3S3.10.3s3.10.4S3.10.4s3.10.5S3.10.5s3.10.6S3.10.6s3.10.7S3.10.7s3.10.8S3.10.8aS3.10.8as3.10.8s3.10.9S3.10.9s3.11.0S3.11.0s3.11.1S3.11.1s3.11.2S3.11.2s3.11.3S3.11.3s3.11.4S3.11.4s3.12.0S3.12.0s3.12.1S3.12.1s3.12.2S3.12.2s3.12.3S3.12.3s3.12.4S3.12.4s3.13.0S3.13.0s3.13.10S3.13.10s3.13.1S3.13.1s3.13.2S3.13.2s3.13.3S3.13.3s3.13.4S3.13.4s3.13.5S3.13.5s3.13.6S3.13.6aS3.13.6as3.13.6s3.13.7S3.13.7s3.13.8S3.13.8s3.13.9S3.13.9s3.14.0S3.14.0s3.14.1S3.14.1s3.14.2S3.14.2s3.14.3S3.14.3s3.14.4S3.14.4s3.15.0S3.15.0s3.15.1S3.15.1cS3.15.1cs3.15.1s3.15.2S3.15.2s3.15.3S3.15.3s3.15.4S3.15.4s3.16.0S3.16.0cS3.16.0cs3.16.0s3.16.10S3.16.10s3.16.1aS3.16.1as3.16.2S3.16.2s3.16.3S3.16.3s3.16.4aS3.16.4as3.16.4bS3.16.4bs3.16.4dS3.16.4ds3.16.5S3.16.5s3.16.6S3.16.6bS3.16.6bs3.16.6s3.16.7S3.16.7aS3.16.7as3.16.7bS3.16.7bs3.16.7s3.16.8S3.16.8s3.16.9S3.16.9s3.17.0S3.17.0s3.17.1S3.17.1s3.17.2S3.17.2s3.17.3S3.17.3s3.17.4S3.17.4s3.18.2aSP3.18.2asp3.9.0aS3.9.0as3.9.1S3.9.1s3.9.2S3.9.2s

Remediation

No guide yet

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

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

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

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-476

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