NULL pointer dereference in Cisco iOS Xe Software
CVE-2024-20436
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.
EPSS: 0.009 (54.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H.
Affected products
- Cisco Ios Xe Software — versions 3.9.1S, 3.9.2S, 3.9.0aS
- Cisco Ios_xe — versions 3.9.0as, 3.9.1s, 3.9.2s
Weakness classification (CWE)
Public proof-of-concept exploits
References
- psirt@cisco.com (Vendor Advisory)
Frequently asked questions
- What is CVE-2024-20436?
- CVE-2024-20436 is a high-severity vulnerability in Cisco iOS Xe Software, classified under NULL Pointer Dereference. CVSS score: 8.6/10. Published 2024-09-25.
- How severe is CVE-2024-20436?
- High severity. CVSS v3 base score is 8.6 out of 10.
- Is CVE-2024-20436 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.