How severe is CVE-2024-20455?

CVE-2024-20455 has a CVSS 3.x base score of 8.6, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2024-20455 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-20455?

CVE-2024-20455 primarily affects Cisco Ios Xe. In total, 101 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2024-20455?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2024-20455 have an EU (EUVD) identifier?

Yes. CVE-2024-20455 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-18170.

When was CVE-2024-20455 published?

CVE-2024-20455 was published on 2024-09-25 and last updated on 2026-06-17.

CVE-2024-20455

CVE-2024-20455 is a high-severity vulnerability in Cisco Ios Xe with a CVSS 3.x base score of 8.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-371.

Key facts

Severity: High (CVSS 3.x base score 8.6)
EPSS exploit prediction: 1% (47th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-18170
Weakness: CWE-371
Affected product: Cisco Ios Xe
Published: 2024-09-25
Last modified: 2026-06-17

Description

A vulnerability in the process that classifies traffic that is going to the Unified Threat Defense (UTD) component of Cisco IOS XE Software in controller mode could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability exists because UTD improperly handles certain packets as those packets egress an SD-WAN IPsec tunnel. An attacker could exploit this vulnerability by sending crafted traffic through an SD-WAN IPsec tunnel that is configured on an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition. Note: SD-WAN tunnels that are configured with Generic Routing Encapsulation (GRE) are not affected by this vulnerability.

Frequently asked questions

What is CVE-2024-20455?: A vulnerability in the process that classifies traffic that is going to the Unified Threat Defense (UTD) component of Cisco IOS XE Software in controller mode could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability exists because UTD improperly handles certain packets as those packets egress an SD-WAN IPsec tunnel. An attacker could exploit this vulnerability by sending crafted traffic through an SD-WAN IPsec tunnel that is configured on an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition. Note: SD-WAN tunnels that are configured with Generic Routing Encapsulation (GRE) are not affected by this vulnerability.
How severe is CVE-2024-20455?: CVE-2024-20455 has a CVSS 3.x base score of 8.6, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2024-20455 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-20455?: CVE-2024-20455 primarily affects Cisco Ios Xe. In total, 101 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2024-20455?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2024-20455 have an EU (EUVD) identifier?: Yes. CVE-2024-20455 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-18170.
When was CVE-2024-20455 published?: CVE-2024-20455 was published on 2024-09-25 and last updated on 2026-06-17.

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-utd-dos-hDATqxs

Affected products (101)

cpe:2.3:o:cisco:ios_xe:17.1.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.1.1a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.1.1s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.1.1t:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.1.3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.2.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.2.1a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.2.1r:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.2.1v:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.2.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.2.3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.3.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.3.1a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.3.1w:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.3.1x:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.3.1z:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.3.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.3.2a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.3.3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.3.4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.3.4a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.3.4b:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.3.4c:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.3.5:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.3.5a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.3.5b:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.3.6:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.3.7:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.3.8:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.3.8a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.4.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.4.1a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.4.1b:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.4.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.4.2a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.5.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.5.1a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.6.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.6.1a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.6.1w:*:*:*:*:*:*:*

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