How severe is CVE-2022-20686?

CVE-2022-20686 has a CVSS 3.x base score of 5.3, rated medium 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 low.

Is CVE-2022-20686 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2022-20686?

CVE-2022-20686 primarily affects Cisco Ata 190 Firmware. In total, 9 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2022-20686?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2022-20686 published?

CVE-2022-20686 was published on 2022-12-12 and last updated on 2026-06-17.

CVE-2022-20686

CVE-2022-20686 is a medium-severity vulnerability in Cisco Ata 190 Firmware with a CVSS 3.x base score of 5.3. 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-1284.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
EPSS exploit prediction: 1% (56th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-1284
Affected product: Cisco Ata 190 Firmware
Published: 2022-12-12
Last modified: 2026-06-17

Description

Multiple vulnerabilities in the Link Layer Discovery Protocol (LLDP) functionality of Cisco ATA 190 Series Analog Telephone Adapter firmware could allow an unauthenticated, remote attacker to execute arbitrary code on an affected device and cause the LLDP service to restart. These vulnerabilities are due to missing length validation of certain LLDP packet header fields. An attacker could exploit these vulnerabilities by sending a malicious LLDP packet to an affected device. A successful exploit could allow the attacker to execute code on the affected device and cause LLDP to restart unexpectedly, resulting in a denial of service (DoS) condition.

Frequently asked questions

What is CVE-2022-20686?: Multiple vulnerabilities in the Link Layer Discovery Protocol (LLDP) functionality of Cisco ATA 190 Series Analog Telephone Adapter firmware could allow an unauthenticated, remote attacker to execute arbitrary code on an affected device and cause the LLDP service to restart. These vulnerabilities are due to missing length validation of certain LLDP packet header fields. An attacker could exploit these vulnerabilities by sending a malicious LLDP packet to an affected device. A successful exploit could allow the attacker to execute code on the affected device and cause LLDP to restart unexpectedly, resulting in a denial of service (DoS) condition.
How severe is CVE-2022-20686?: CVE-2022-20686 has a CVSS 3.x base score of 5.3, rated medium 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 low.
Is CVE-2022-20686 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2022-20686?: CVE-2022-20686 primarily affects Cisco Ata 190 Firmware. In total, 9 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2022-20686?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2022-20686 published?: CVE-2022-20686 was published on 2022-12-12 and last updated on 2026-06-17.

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ata19x-multivuln-GEZYVvs

Affected products (9)

cpe:2.3:o:cisco:ata_190_firmware:-:*:*:*:on-premises:*:*:*
cpe:2.3:o:cisco:ata_191_firmware:*:*:*:*:multiplatform:*:*:*
cpe:2.3:o:cisco:ata_191_firmware:*:*:*:*:on-premises:*:*:*
cpe:2.3:o:cisco:ata_191_firmware:12.0.1:-:*:*:on-premises:*:*:*
cpe:2.3:o:cisco:ata_191_firmware:12.0.1:sr1:*:*:on-premises:*:*:*
cpe:2.3:o:cisco:ata_191_firmware:12.0.1:sr2:*:*:on-premises:*:*:*
cpe:2.3:o:cisco:ata_191_firmware:12.0.1:sr3:*:*:on-premises:*:*:*
cpe:2.3:o:cisco:ata_191_firmware:12.0.1:sr4:*:*:on-premises:*:*:*
cpe:2.3:o:cisco:ata_192_firmware:*:*:*:*:multiplatform:*:*:*

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