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CVE-2024-20508

MEDIUMCVSS 6.5/10EPSS 0.43%

Last modified

CVE-2024-20508 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. A vulnerability in Cisco Unified Threat Defense (UTD) Snort Intrusion Prevention System (IPS) Engine for Cisco IOS XE Software could allow an unauthenticated, remote attacker to bypass configured security policies or cause a denial of service (DoS) condition on an affected device. This vulnerability is due to insufficient validation of HTTP requests when they are processed by Cisco UTD Snort IPS Engine. An attacker could exploit this vulnerability by sending a crafted HTTP request through an affected device. EPSS estimates a 0.43% chance of exploitation in the next 30 days.

Description

A vulnerability in Cisco Unified Threat Defense (UTD) Snort Intrusion Prevention System (IPS) Engine for Cisco IOS XE Software could allow an unauthenticated, remote attacker to bypass configured security policies or cause a denial of service (DoS) condition on an affected device. This vulnerability is due to insufficient validation of HTTP requests when they are processed by Cisco UTD Snort IPS Engine. An attacker could exploit this vulnerability by sending a crafted HTTP request through an affected device. A successful exploit could allow the attacker to trigger a reload of the Snort process. If the action in case of Cisco UTD Snort IPS Engine failure is set to the default, fail-open, successful exploitation of this vulnerability could allow the attacker to bypass configured security policies. If the action in case of Cisco UTD Snort IPS Engine failure is set to fail-close, successful exploitation of this vulnerability could cause traffic that is configured to be inspected by Cisco UTD Snort IPS Engine to be dropped.

Metrics

CVSS 3.1
6.5/10

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

EPSS Probability
0.43%

34.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CiscoUnified Threat Defense Snort Intrusion Prevention System Engine17.6.1a
CiscoUnified Threat Defense Snort Intrusion Prevention System Engine17.6.2
CiscoUnified Threat Defense Snort Intrusion Prevention System Engine17.6.6
CiscoUnified Threat Defense Snort Intrusion Prevention System Engine17.7.1a
CiscoUnified Threat Defense Snort Intrusion Prevention System Engine17.7.2
CiscoUnified Threat Defense Snort Intrusion Prevention System Engine17.8.1a
CiscoUnified Threat Defense Snort Intrusion Prevention System Engine17.9.5a
CiscoUnified Threat Defense Snort Intrusion Prevention System Engine17.11.1a
CiscoUnified Threat Defense Snort Intrusion Prevention System Engine17.12.1a
CiscoUnified Threat Defense Snort Intrusion Prevention System Engine17.12.2
CiscoUnified Threat Defense Snort Intrusion Prevention System Engine17.12.3
CiscoUnified Threat Defense Snort Intrusion Prevention System Engine17.12.3a
CiscoUnified Threat Defense Snort Intrusion Prevention System Engine17.12.4
CiscoUnified Threat Defense Snort Intrusion Prevention System Engine17.13.1a
CiscoUnified Threat Defense Snort Intrusion Prevention System Engine17.14.1a
CiscoUnified Threat Defense Snort Intrusion Prevention System Engine17.15.1a

References

Timeline

Published
Last Modified
Status
Analyzed

Frequently Asked Questions

What is CVE-2024-20508?
A vulnerability in Cisco Unified Threat Defense (UTD) Snort Intrusion Prevention System (IPS) Engine for Cisco IOS XE Software could allow an unauthenticated, remote attacker to bypass configured security policies or cause a denial of service (DoS) condition on an affected device. This vulnerability is due to insufficient validation of HTTP requests when they are processed by Cisco UTD Snort IPS Engine. An attacker could exploit this vulnerability by sending a crafted HTTP request through an affected device. A successful exploit could allow the attacker to trigger a reload of the Snort process. If the action in case of Cisco UTD Snort IPS Engine failure is set to the default, fail-open, successful exploitation of this vulnerability could allow the attacker to bypass configured security policies. If the action in case of Cisco UTD Snort IPS Engine failure is set to fail-close, successful exploitation of this vulnerability could cause traffic that is configured to be inspected by Cisco UTD Snort IPS Engine to be dropped.
How severe is CVE-2024-20508?
CVE-2024-20508 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.43% probability of exploitation in the next 30 days.
How do I fix CVE-2024-20508?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST