How severe is CVE-2024-20421?

CVE-2024-20421 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity high, and availability low.

Is CVE-2024-20421 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-20421?

CVE-2024-20421 primarily affects Cisco Ata 191 Firmware. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2024-20421?

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-2024-20421 have an EU (EUVD) identifier?

Yes. CVE-2024-20421 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-18136.

When was CVE-2024-20421 published?

CVE-2024-20421 was published on 2024-10-16 and last updated on 2026-06-17.

CVE-2024-20421

CVE-2024-20421 is a high-severity vulnerability in Cisco Ata 191 Firmware with a CVSS 3.x base score of 7.1. 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-352.

Key facts

Severity: High (CVSS 3.x base score 7.1)
EPSS exploit prediction: 0% (14th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-18136
Weakness: CWE-352
Affected product: Cisco Ata 191 Firmware
Published: 2024-10-16
Last modified: 2026-06-17

Description

A vulnerability in the web-based management interface of Cisco ATA 190 Series Analog Telephone Adapter firmware could allow an unauthenticated, remote attacker to conduct a cross-site request forgery (CSRF) attack and perform arbitrary actions on an affected device. This vulnerability is due to insufficient CSRF protections for the web-based management interface of an affected device. An attacker could exploit this vulnerability by persuading a user to follow a crafted link. A successful exploit could allow the attacker to perform arbitrary actions on the affected device with the privileges of the targeted user.

Frequently asked questions

What is CVE-2024-20421?: A vulnerability in the web-based management interface of Cisco ATA 190 Series Analog Telephone Adapter firmware could allow an unauthenticated, remote attacker to conduct a cross-site request forgery (CSRF) attack and perform arbitrary actions on an affected device. This vulnerability is due to insufficient CSRF protections for the web-based management interface of an affected device. An attacker could exploit this vulnerability by persuading a user to follow a crafted link. A successful exploit could allow the attacker to perform arbitrary actions on the affected device with the privileges of the targeted user.
How severe is CVE-2024-20421?: CVE-2024-20421 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity high, and availability low.
Is CVE-2024-20421 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-20421?: CVE-2024-20421 primarily affects Cisco Ata 191 Firmware. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2024-20421?: 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-2024-20421 have an EU (EUVD) identifier?: Yes. CVE-2024-20421 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-18136.
When was CVE-2024-20421 published?: CVE-2024-20421 was published on 2024-10-16 and last updated on 2026-06-17.

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ata19x-multi-RDTEqRsy

Affected products (2)

cpe:2.3:o:cisco:ata_191_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ata_192_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Cisco Ata 191 Firmware

CVE-2021-34735 — High (CVSS 8.8): Multiple vulnerabilities in the Cisco ATA 190 Series Analog Telephone Adapter Software could allow an attacker to…
CVE-2021-34710 — High (CVSS 8.8): Multiple vulnerabilities in the Cisco ATA 190 Series Analog Telephone Adapter Software could allow an attacker to…
CVE-2024-20458 — High (CVSS 8.2): A vulnerability in the web-based management interface of Cisco ATA 190 Series Analog Telephone Adapter firmware could…
CVE-2024-20459 — Medium (CVSS 6.5): A vulnerability in the web-based management interface of Cisco ATA 190 Multiplatform Series Analog Telephone Adapter…
CVE-2024-20460 — Medium (CVSS 6.1): A vulnerability in the web-based management interface of Cisco ATA 190 Series Analog Telephone Adapter firmware could…
CVE-2024-20461 — Medium (CVSS 6.0): A vulnerability in the CLI of Cisco ATA 190 Series Analog Telephone Adapter firmware could allow an authenticated,…

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