CVE-2022-20846
Cisco IOS XR Software Cisco Discovery Protocol Buffer Overflow Vulnerability
- Published
- Updated
- Reserved
- Assigned by
- cisco
Description
A vulnerability in the Cisco Discovery Protocol implementation for Cisco IOS XR Software could allow an unauthenticated, adjacent attacker to cause the Cisco Discovery Protocol process to reload on an affected device. This vulnerability is due to a heap buffer overflow in certain Cisco Discovery Protocol messages. An attacker could exploit this vulnerability by sending a malicious Cisco Discovery Protocol packet to an affected device. A successful exploit could allow the attacker to cause a heap overflow, which could cause the Cisco Discovery Protocol process to reload on the device. The bytes that can be written in the buffer overflow are restricted, which limits remote code execution.Note: Cisco Discovery Protocol is a Layer 2 protocol. To exploit this vulnerability, an attacker must be in the same broadcast domain as the affected device (Layer 2 adjacent). Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.This advisory is part of the September 2022 release of the Cisco IOS XR Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see .
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 | Medium4.3 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
| NVDNVD · Analyzed | 3.1 | Medium4.3 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
- EPSS (exploitation in 30 days)
- 1.00% · top 37% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.3.
Weakness
Affected products
- affected 6.5.3
- affected 6.5.29
- affected 6.5.1
- affected 6.6.1
- affected 6.5.2
- affected 6.5.92
- affected 6.5.15
- affected 6.6.2
- affected 7.0.1
- affected 6.6.25
- affected 6.5.26
- affected 6.6.11
- affected 6.5.25
- affected 6.5.28
- affected 6.5.93
- affected 6.6.12
- affected 6.5.90
- affected 7.0.0
- affected 7.1.1
- affected 7.0.90
- affected 6.6.3
- affected 6.7.1
- affected 7.0.2
- affected 7.1.15
- affected 7.2.0
- affected 7.2.1
- affected 7.1.2
- affected 6.7.2
- affected 7.0.11
- affected 7.0.12
- affected 7.0.14
- affected 7.1.25
- affected 6.6.4
- affected 7.2.12
- affected 7.3.1
- affected 7.1.3
- affected 6.7.3
- affected 7.4.1
- affected 7.2.2
- affected 6.7.4
- and 20 more
What to do
Exploitation: The Cisco PSIRT is aware that proof-of-concept exploit code is available for the vulnerability described in this advisory. The Cisco PSIRT is not aware of any malicious use of the vulnerability that is described in this advisory.
References (3)
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-2022-20846)Record last updated .