How severe is CVE-2024-20433?

CVE-2024-20433 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-2024-20433 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-20433?

CVE-2024-20433 primarily affects Cisco Ios. In total, 2434 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2024-20433?

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-2024-20433 have an EU (EUVD) identifier?

Yes. CVE-2024-20433 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-18148.

When was CVE-2024-20433 published?

CVE-2024-20433 was published on 2024-09-25 and last updated on 2026-06-17.

CVE-2024-20433

CVE-2024-20433 is a high-severity vulnerability in Cisco Ios 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-787.

Key facts

Severity: High (CVSS 3.x base score 8.6)
EPSS exploit prediction: 1% (46th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-18148
Weakness: CWE-787
Affected product: Cisco Ios
Published: 2024-09-25
Last modified: 2026-06-17

Description

A vulnerability in the Resource Reservation Protocol (RSVP) feature of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload unexpectedly, resulting in a denial of service (DoS) condition. This vulnerability is due to a buffer overflow when processing crafted RSVP packets. An attacker could exploit this vulnerability by sending RSVP traffic to an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition.

Frequently asked questions

What is CVE-2024-20433?: A vulnerability in the Resource Reservation Protocol (RSVP) feature of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload unexpectedly, resulting in a denial of service (DoS) condition. This vulnerability is due to a buffer overflow when processing crafted RSVP packets. An attacker could exploit this vulnerability by sending RSVP traffic to an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition.
How severe is CVE-2024-20433?: CVE-2024-20433 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-2024-20433 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-20433?: CVE-2024-20433 primarily affects Cisco Ios. In total, 2434 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2024-20433?: 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-2024-20433 have an EU (EUVD) identifier?: Yes. CVE-2024-20433 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-18148.
When was CVE-2024-20433 published?: CVE-2024-20433 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-rsvp-dos-OypvgVZf

Affected products (2434)

cpe:2.3:o:cisco:ios:12.0\(24\)s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0\(24\)s1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0\(24\)s2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0\(24\)s2a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0\(24\)s2b:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0\(24\)s3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0\(24\)s4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0\(24\)s4a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0\(24\)s5:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0\(24\)s6:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0\(25\)s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0\(25\)s1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0\(25\)s1a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0\(25\)s1b:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0\(25\)s1c:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0\(25\)s1d:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0\(25\)s2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0\(25\)s3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0\(25\)s4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0\(25\)sx:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0\(25\)sx1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0\(25\)sx2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0\(25\)sx3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0\(25\)sx4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0\(25\)sx5:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0\(25\)sx6:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0\(25\)sx6e:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0\(25\)sx7:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0\(25\)sx8:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0\(25\)sx9:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0\(25\)sx10:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0\(26\)s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0\(26\)s1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0\(26\)s2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0\(26\)s3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0\(26\)s4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0\(26\)s5:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0\(26\)s6:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0\(27\)s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0\(27\)s1:*:*:*:*:*:*:*

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