How severe is CVE-2024-20435?

CVE-2024-20435 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2024-20435 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-20435?

CVE-2024-20435 primarily affects Cisco Asyncos. In total, 27 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2024-20435?

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-2024-20435 have an EU (EUVD) identifier?

Yes. CVE-2024-20435 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-18150.

When was CVE-2024-20435 published?

CVE-2024-20435 was published on 2024-07-17 and last updated on 2026-06-17.

CVE-2024-20435

CVE-2024-20435 is a high-severity vulnerability in Cisco Asyncos with a CVSS 3.x base score of 8.8. 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-250.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 0% (6th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-18150
Weakness: CWE-250
Affected product: Cisco Asyncos
Published: 2024-07-17
Last modified: 2026-06-17

Description

A vulnerability in the CLI of Cisco AsyncOS for Secure Web Appliance could allow an authenticated, local attacker to execute arbitrary commands and elevate privileges to root. This vulnerability is due to insufficient validation of user-supplied input for the CLI. An attacker could exploit this vulnerability by authenticating to the system and executing a crafted command on the affected device. A successful exploit could allow the attacker to execute arbitrary commands on the underlying operating system and elevate privileges to root. To successfully exploit this vulnerability, an attacker would need at least guest credentials.

Frequently asked questions

What is CVE-2024-20435?: A vulnerability in the CLI of Cisco AsyncOS for Secure Web Appliance could allow an authenticated, local attacker to execute arbitrary commands and elevate privileges to root. This vulnerability is due to insufficient validation of user-supplied input for the CLI. An attacker could exploit this vulnerability by authenticating to the system and executing a crafted command on the affected device. A successful exploit could allow the attacker to execute arbitrary commands on the underlying operating system and elevate privileges to root. To successfully exploit this vulnerability, an attacker would need at least guest credentials.
How severe is CVE-2024-20435?: CVE-2024-20435 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2024-20435 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-20435?: CVE-2024-20435 primarily affects Cisco Asyncos. In total, 27 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2024-20435?: 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-2024-20435 have an EU (EUVD) identifier?: Yes. CVE-2024-20435 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-18150.
When was CVE-2024-20435 published?: CVE-2024-20435 was published on 2024-07-17 and last updated on 2026-06-17.

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-swa-priv-esc-7uHpZsCC

Affected products (27)

cpe:2.3:o:cisco:asyncos:11.7.0-406:*:*:*:*:*:*:*
cpe:2.3:o:cisco:asyncos:11.7.0-418:*:*:*:*:*:*:*
cpe:2.3:o:cisco:asyncos:11.7.1-006:*:*:*:*:*:*:*
cpe:2.3:o:cisco:asyncos:11.7.1-020:*:*:*:*:*:*:*
cpe:2.3:o:cisco:asyncos:11.7.1-049:*:*:*:*:*:*:*
cpe:2.3:o:cisco:asyncos:11.7.2-011:*:*:*:*:*:*:*
cpe:2.3:o:cisco:asyncos:11.8.0-414:*:*:*:*:*:*:*
cpe:2.3:o:cisco:asyncos:11.8.1-023:*:*:*:*:*:*:*
cpe:2.3:o:cisco:asyncos:11.8.3-018:*:*:*:*:*:*:*
cpe:2.3:o:cisco:asyncos:11.8.3-021:*:*:*:*:*:*:*
cpe:2.3:o:cisco:asyncos:12.0.1-268:*:*:*:*:*:*:*
cpe:2.3:o:cisco:asyncos:12.0.3-007:*:*:*:*:*:*:*
cpe:2.3:o:cisco:asyncos:12.5.1-011:*:*:*:*:*:*:*
cpe:2.3:o:cisco:asyncos:12.5.2-007:*:*:*:*:*:*:*
cpe:2.3:o:cisco:asyncos:12.5.4-005:*:*:*:*:*:*:*
cpe:2.3:o:cisco:asyncos:12.5.5-004:*:*:*:*:*:*:*
cpe:2.3:o:cisco:asyncos:12.5.6-008:*:*:*:*:*:*:*
cpe:2.3:o:cisco:asyncos:14.0.2-012:*:*:*:*:*:*:*
cpe:2.3:o:cisco:asyncos:14.0.3-014:*:*:*:*:*:*:*
cpe:2.3:o:cisco:asyncos:14.0.4-005:*:*:*:*:*:*:*
cpe:2.3:o:cisco:asyncos:14.0.5-007:*:*:*:*:*:*:*
cpe:2.3:o:cisco:asyncos:14.5.0-498:*:*:*:*:*:*:*
cpe:2.3:o:cisco:asyncos:14.5.1-016:*:*:*:*:*:*:*
cpe:2.3:o:cisco:asyncos:14.5.2-011:*:*:*:*:*:*:*
cpe:2.3:o:cisco:asyncos:15.0.0-322:*:*:*:*:*:*:*
cpe:2.3:o:cisco:asyncos:15.0.0-355:*:*:*:*:*:*:*
cpe:2.3:o:cisco:asyncos:15.1.0-287:*:*:*:*:*:*:*

More vulnerabilities in Cisco Asyncos

CVE-2025-20393 — Critical (CVSS 10.0): A vulnerability in the Spam Quarantine feature of Cisco AsyncOS Software for Cisco Secure Email Gateway and Cisco…
CVE-2019-15956 — High (CVSS 8.8): A vulnerability in the web management interface of Cisco AsyncOS Software for Cisco Web Security Appliance (WSA) could…
CVE-2021-34698 — High (CVSS 8.6): A vulnerability in the proxy service of Cisco AsyncOS for Cisco Web Security Appliance (WSA) could allow an…
CVE-2019-1947 — High (CVSS 8.6): A vulnerability in the email message filtering feature of Cisco AsyncOS Software for Cisco Email Security Appliance…
CVE-2019-1886 — High (CVSS 8.6): A vulnerability in the HTTPS decryption feature of Cisco Web Security Appliance (WSA) could allow an unauthenticated,…
CVE-2018-15460 — High (CVSS 8.6): A vulnerability in the email message filtering feature of Cisco AsyncOS Software for Cisco Email Security Appliances…

All CVEs affecting Cisco Asyncos →

Other CWE-250 vulnerabilities

CVE-2026-4606 — Critical (CVSS 10.0): GV Edge Recording Manager (ERM) v2.3.1 improperly runs application components with SYSTEM-level privileges, allowing…
CVE-2022-2634 — Critical (CVSS 10.0): An attacker may be able to execute malicious actions due to the lack of device access protections and device…
CVE-2026-48584 — Critical (CVSS 9.9): Execution with unnecessary privileges in Azure Synapse allows an authorized attacker to elevate privileges over a…
CVE-2026-50566 — Critical (CVSS 9.9): Fission is an open-source, Kubernetes-native serverless framework that simplifies the deployment of functions and…
CVE-2026-44477 — Critical (CVSS 9.9): CloudNativePG is a platform designed to manage PostgreSQL databases within Kubernetes environments. Prior to 1.29.1 and…
CVE-2026-25212 — Critical (CVSS 9.9): An issue was discovered in Percona PMM before 3.7. Because an internal database user retains specific superuser…

Browse all CWE-250 vulnerabilities →