CVE-2024-20309
CVE-2024-20309 is a medium-severity vulnerability in Cisco Ios Xe with a CVSS 3.x base score of 5.6. 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-828.
Key facts
- Severity: Medium (CVSS 3.x base score 5.6)
- EPSS exploit prediction: 0% (1st percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2024-18024
- Weakness: CWE-828
- Affected product: Cisco Ios Xe
- Published:
- Last modified:
Description
A vulnerability in auxiliary asynchronous port (AUX) functions of Cisco IOS XE Software could allow an authenticated, local attacker to cause an affected device to reload or stop responding. This vulnerability is due to the incorrect handling of specific ingress traffic when flow control hardware is enabled on the AUX port. An attacker could exploit this vulnerability by reverse telnetting to the AUX port and sending specific data after connecting. A successful exploit could allow the attacker to cause the device to reset or stop responding, resulting in a denial of service (DoS) condition.
Frequently asked questions
- What is CVE-2024-20309?
- A vulnerability in auxiliary asynchronous port (AUX) functions of Cisco IOS XE Software could allow an authenticated, local attacker to cause an affected device to reload or stop responding. This vulnerability is due to the incorrect handling of specific ingress traffic when flow control hardware is enabled on the AUX port. An attacker could exploit this vulnerability by reverse telnetting to the AUX port and sending specific data after connecting. A successful exploit could allow the attacker to cause the device to reset or stop responding, resulting in a denial of service (DoS) condition.
- How severe is CVE-2024-20309?
- CVE-2024-20309 has a CVSS 3.x base score of 5.6, rated medium severity. It is exploitable over local access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
- Is CVE-2024-20309 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (1st percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2024-20309?
- CVE-2024-20309 primarily affects Cisco Ios Xe. In total, 343 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2024-20309?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2024-20309 have an EU (EUVD) identifier?
- Yes. CVE-2024-20309 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-18024.
- When was CVE-2024-20309 published?
- CVE-2024-20309 was published on 2024-03-27 and last updated on 2026-06-17.
References
Affected products (343)
- cpe:2.3:o:cisco:ios_xe:3.2.0se:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:3.2.1se:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:3.2.2se:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:3.2.3se:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:3.3.0se:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:3.3.0sq:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:3.3.1se:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:3.3.1sq:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:3.3.2se:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:3.3.3se:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:3.3.4se:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:3.3.5se:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:3.4.0sq:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:3.4.1sq:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:3.5.0sq:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:3.5.1sq:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:3.5.2sq:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:3.5.3sq:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:3.5.4sq:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:3.5.5sq:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:3.5.6sq:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:3.5.7sq:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:3.5.8sq:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:3.6.2ae:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:3.6.2e:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:3.6.5be:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:3.6.7be:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:3.6.9e:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:3.6.10e:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:3.7.0bs:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:3.7.0s:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:3.7.1as:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:3.7.1s:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:3.7.2s:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:3.7.2ts:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:3.7.3s:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:3.7.4as:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:3.7.4s:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:3.7.5s:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xe:3.7.6s:*:*:*:*:*:*:*
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