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CVE-2024-20309

MEDIUM
Published 2024-03-27T17:02:19.749Z
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CVSS Score

V3.1
5.6
/10
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H
Base Score Metrics
Exploitability: N/A Impact: N/A

EPSS Score

v2025.03.14
0.000
probability
of exploitation in the wild

There is a 0.0% chance that this vulnerability will be exploited in the wild within the next 30 days.

Updated: 2025-06-25
Exploit Probability
Percentile: 0.098
Higher than 9.8% of all CVEs

Attack Vector Metrics

Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED

Impact Metrics

Confidentiality
NONE
Integrity
NONE
Availability
HIGH

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.

Available Exploits

No exploits available for this CVE.

Related News

No news articles found for this CVE.

Affected Products

Cisco

Cisco IOS XE Software

Affected Versions:

3.7.0S 3.7.1S 3.7.2S 3.7.3S 3.7.4S 3.7.5S 3.7.6S 3.7.7S 3.7.4aS 3.7.2tS 3.7.0bS 3.7.1aS 3.8.0S 3.8.1S 3.8.2S 3.9.1S 3.9.0S 3.9.2S 3.9.1aS 3.9.0aS 3.2.0SE 3.2.1SE 3.2.2SE 3.2.3SE 3.3.0SE 3.3.1SE 3.3.2SE 3.3.3SE 3.3.4SE 3.3.5SE 3.10.0S 3.10.1S 3.10.2S 3.10.3S 3.10.4S 3.10.5S 3.10.6S 3.10.2tS 3.10.7S 3.10.1xbS 3.10.8S 3.10.8aS 3.10.9S 3.10.10S 3.11.1S 3.11.2S 3.11.0S 3.11.3S 3.11.4S 3.12.0S 3.12.1S 3.12.2S 3.12.3S 3.12.0aS 3.12.4S 3.13.0S 3.13.1S 3.13.2S 3.13.3S 3.13.4S 3.13.5S 3.13.2aS 3.13.0aS 3.13.5aS 3.13.6S 3.13.7S 3.13.6aS 3.13.7aS 3.13.8S 3.13.9S 3.13.10S 3.6.2aE 3.6.2E 3.6.5bE 3.6.7bE 3.6.9E 3.6.10E 3.14.0S 3.14.1S 3.14.2S 3.14.3S 3.14.4S 3.15.0S 3.15.1S 3.15.2S 3.15.1cS 3.15.3S 3.15.4S 3.3.0SQ 3.3.1SQ 3.4.0SQ 3.4.1SQ 3.5.0SQ 3.5.1SQ 3.5.2SQ 3.5.3SQ 3.5.4SQ 3.5.5SQ 3.5.6SQ 3.5.7SQ 3.5.8SQ 3.16.0S 3.16.1S 3.16.1aS 3.16.2S 3.16.2aS 3.16.0cS 3.16.3S 3.16.2bS 3.16.3aS 3.16.4S 3.16.4aS 3.16.4bS 3.16.5S 3.16.4dS 3.16.6S 3.16.7S 3.16.6bS 3.16.7aS 3.16.7bS 3.16.8S 3.16.9S 3.16.10S 3.17.0S 3.17.1S 3.17.2S 3.17.1aS 3.17.3S 3.17.4S 16.1.1 16.1.2 16.1.3 16.2.1 16.2.2 16.3.1 16.3.2 16.3.3 16.3.1a 16.3.4 16.3.5 16.3.5b 16.3.6 16.3.7 16.3.8 16.3.9 16.3.10 16.3.11 16.4.1 16.4.2 16.4.3 16.5.1 16.5.1a 16.5.1b 16.5.2 16.5.3 3.18.0aS 3.18.0S 3.18.1S 3.18.2S 3.18.3S 3.18.4S 3.18.0SP 3.18.1SP 3.18.1aSP 3.18.1bSP 3.18.1cSP 3.18.2SP 3.18.2aSP 3.18.3SP 3.18.4SP 3.18.3aSP 3.18.3bSP 3.18.5SP 3.18.6SP 3.18.7SP 3.18.8aSP 3.18.9SP 16.6.1 16.6.2 16.6.3 16.6.4 16.6.5 16.6.4a 16.6.5a 16.6.6 16.6.7 16.6.8 16.6.9 16.6.10 16.7.1 16.7.1a 16.7.1b 16.7.2 16.7.3 16.7.4 16.8.1 16.8.1a 16.8.1b 16.8.1s 16.8.1c 16.8.1d 16.8.2 16.8.1e 16.8.3 16.9.1 16.9.2 16.9.1a 16.9.1b 16.9.1s 16.9.3 16.9.4 16.9.3a 16.9.5 16.9.5f 16.9.6 16.9.7 16.9.8 16.10.1 16.10.1a 16.10.1b 16.10.1s 16.10.1c 16.10.1e 16.10.1d 16.10.2 16.10.1f 16.10.1g 16.10.3 16.11.1 16.11.1a 16.11.1b 16.11.2 16.11.1s 16.12.1 16.12.1s 16.12.1a 16.12.1c 16.12.1w 16.12.2 16.12.1y 16.12.2a 16.12.3 16.12.8 16.12.2s 16.12.1x 16.12.1t 16.12.4 16.12.3s 16.12.3a 16.12.4a 16.12.5 16.12.6 16.12.1z1 16.12.5a 16.12.5b 16.12.1z2 16.12.6a 16.12.7 16.12.9 16.12.10 16.12.10a 17.1.1 17.1.1a 17.1.1s 17.1.1t 17.1.3 17.2.1 17.2.1r 17.2.1a 17.2.1v 17.2.2 17.2.3 17.3.1 17.3.2 17.3.3 17.3.1a 17.3.1w 17.3.2a 17.3.1x 17.3.1z 17.3.4 17.3.5 17.3.4a 17.3.6 17.3.4b 17.3.4c 17.3.5a 17.3.5b 17.3.7 17.3.8 17.3.8a 17.4.1 17.4.2 17.4.1a 17.4.1b 17.4.2a 17.5.1 17.5.1a 17.6.1 17.6.2 17.6.1w 17.6.1a 17.6.1x 17.6.3 17.6.1y 17.6.1z 17.6.3a 17.6.4 17.6.1z1 17.6.5 17.6.6 17.6.6a 17.6.5a 17.7.1 17.7.1a 17.7.1b 17.7.2 17.10.1 17.10.1a 17.10.1b 17.8.1 17.8.1a 17.9.1 17.9.1w 17.9.2 17.9.1a 17.9.1x 17.9.1y 17.9.3 17.9.2a 17.9.1x1 17.9.3a 17.9.4 17.9.1y1 17.9.4a 17.11.1 17.11.1a 17.12.1 17.12.1w 17.12.1a 17.12.2 17.12.2a 17.11.99SW

EU Vulnerability Database

Monitored by ENISA for EU cybersecurity

EU Coordination

EU Coordinated

Exploitation Status

No Known Exploitation

EUVD ID

View on ENISA

ENISA Analysis

Malicious code in bioql (PyPI)

Affected Products (ENISA)

cisco
cisco ios xe software

ENISA Scoring

CVSS Score (3.1)

5.6
/10
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H

EPSS Score

0.040
probability

ENISA References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-aux-333WBz8f

Data provided by ENISA EU Vulnerability Database. Last updated: October 3, 2025

GitHub Security Advisories

Community-driven vulnerability intelligence from GitHub

⚠ Unreviewed MODERATE

GHSA-p2c3-pjg6-q385

Advisory Details

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.

CVSS Scoring

CVSS Score

5.0

CVSS Vector

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

References

ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2024-20309
WEB https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-aux-333WBz8f

Advisory provided by GitHub Security Advisory Database. Published: March 27, 2024, Modified: March 27, 2024

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-aux-333WBz8f
Published: 2024-03-27T17:02:19.749Z
Last Modified: 2024-08-09T18:34:29.824Z
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