CVE-2022-20766
Cisco ATA 190 Series Analog Telephone Adapter firmware Cisco Discovery Protocol Denial of Service Vulnerability
- Published
- Updated
- Reserved
- Assigned by
- cisco
Description
A vulnerability in the Cisco Discovery Protocol functionality of Cisco ATA 190 Series Adaptive Telephone Adapter firmware could allow an unauthenticated, remote attacker to cause a DoS condition on an affected device. This vulnerability is due to an out-of-bounds read when processing Cisco Discovery Protocol packets. An attacker could exploit this vulnerability by sending crafted Cisco Discovery Protocol packets to an affected device. A successful exploit could allow the attacker to cause a service restart.Cisco has released firmware updates that address this vulnerability. There are no workarounds that address this vulnerability.
Timeline
ID reserved
By cisco
- 3 years later
· 3 years later
Published
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| ciscoCNA (assigner) | 3.1 | Medium5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
| NVDNVD · Deferred | 3.1 | Medium5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
- EPSS (exploitation in 30 days)
- 0.86% · top 41% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.3.
Weakness
Affected products
Cisco · Cisco Analog Telephone Adaptor (ATA) Software
- affected 2.16(1)
- affected 2.16(2)
- affected 2.1(6)
- affected 2.14
- affected 3.2(0)
- affected 1.1(4)
- affected 2.1(5)
- affected 3.2(1)
- affected 2.15
- affected 1.0(0)
- affected 1.34
- affected 3.1(1)
- affected 3.2(4)
- affected 3.0(0)
- affected 3.2(3)
- affected 3.1(0)
- affected 3.1(2)
- affected 1.2.1
- affected 1.2.2
- affected 1.2.2 SR1
- affected 1.1.2
- affected 1.1.0
- affected 1.1.1
- affected 9.0(3)
- affected 9.2(3)
- affected 9.2(1)
- affected 12.0.1 SR2
- affected 11.1.0
- affected 12.0.1 SR1
- affected 11.1.0 MSR1
- affected 12.0.1
- affected 11.1.0 MSR2
- affected 11.1.0 MSR3
- affected 1.2.2 SR2
- affected 11.1.0 MSR4
- affected 12.0.1 SR3
- affected 11.2.1
- affected 12.0.1 SR4
What to do
Exploitation: The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory.
References (1)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2022-20766)Record last updated .