How severe is CVE-2022-20687?

CVE-2022-20687 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-2022-20687 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-2022-20687?

CVE-2022-20687 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-2022-20687?

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

When was CVE-2022-20687 published?

CVE-2022-20687 was published on 2022-12-12 and last updated on 2026-06-17.

CVE-2022-20687

CVE-2022-20687 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-2022-20687?: 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-2022-20687?: CVE-2022-20687 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-2022-20687 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-2022-20687?: CVE-2022-20687 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-2022-20687?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2022-20687 published?: CVE-2022-20687 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:*:*:*

More vulnerabilities in Cisco Ata 190 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-2022-20691 — Medium (CVSS 5.3): A vulnerability in the Cisco Discovery Protocol functionality of Cisco ATA 190 Series Adaptive Telephone Adapter…
CVE-2022-20690 — Medium (CVSS 5.3): Multiple vulnerabilities in the Cisco Discovery Protocol functionality of Cisco ATA 190 Series Analog Telephone Adapter…
CVE-2022-20689 — Medium (CVSS 5.3): Multiple vulnerabilities in the Cisco Discovery Protocol functionality of Cisco ATA 190 Series Analog Telephone Adapter…
CVE-2022-20688 — Medium (CVSS 5.3): A vulnerability in the Cisco Discovery Protocol functionality of Cisco ATA 190 Series Analog Telephone Adapter firmware…

All CVEs affecting Cisco Ata 190 Firmware →

Other CWE-1284 (Improper Validation of Specified Quantity in Input) vulnerabilities

CVE-2026-49777 — Critical (CVSS 10.0): Improper Validation of Specified Quantity in Input vulnerability in ShapedPlugin, LLC Product Slider Pro for…
CVE-2024-8887 — Critical (CVSS 10.0): CIRCUTOR Q-SMT in its firmware version 1.0.4, could be affected by a denial of service (DoS) attack if an attacker with…
CVE-2022-20699 — Critical (CVSS 10.0): Multiple vulnerabilities in Cisco Small Business RV160, RV260, RV340, and RV345 Series Routers could allow an attacker…
CVE-2021-21960 — Critical (CVSS 10.0): A stack-based buffer overflow vulnerability exists in both the LLMNR functionality of Sealevel Systems, Inc. SeaConnect…
CVE-2021-21951 — Critical (CVSS 10.0): An out-of-bounds write vulnerability exists in the CMD_DEVICE_GET_SERVER_LIST_REQUEST functionality of the…
CVE-2021-21950 — Critical (CVSS 10.0): An out-of-bounds write vulnerability exists in the CMD_DEVICE_GET_SERVER_LIST_REQUEST functionality of the…

Browse all CWE-1284 (Improper Validation of Specified Quantity in Input) vulnerabilities →