CVE-2022-20849
Cisco IOS XR Software Broadband Network Gateway PPPoE Denial of Service Vulnerability
- Published
- Updated
- Reserved
- Assigned by
- cisco
Description
A vulnerability in the Broadband Network Gateway PPP over Ethernet (PPPoE) feature of Cisco IOS XR Software could allow an unauthenticated, adjacent attacker to cause the PPPoE process to continually crash. This vulnerability exists because the PPPoE feature does not properly handle an error condition within a specific crafted packet sequence. An attacker could exploit this vulnerability by sending a sequence of specific PPPoE packets from controlled customer premises equipment (CPE). A successful exploit could allow the attacker to cause the PPPoE process to continually restart, resulting in a denial of service condition (DoS).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 | Medium6.1 | CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H |
| NVDNVD · Analyzed | 3.1 | Medium6.1 | CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.28% · top 80% 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 6.1.
Weakness
Affected products
- affected 6.5.3
- affected 6.6.1
- affected 6.5.15
- affected 7.0.1
- affected 6.6.25
- affected 6.6.2
- affected 6.5.1
- affected 6.5.2
- 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 7.1.2
- affected 7.2.1
- affected 6.7.2
- affected 7.1.25
- affected 6.6.4
- affected 7.3.1
- affected 7.1.3
- affected 6.7.3
- affected 7.4.1
- affected 7.2.2
- affected 6.8.1
- affected 7.3.2
- affected 7.5.1
- affected 7.3.3
- affected 6.8.2
- affected 7.3.4
- affected 7.4.2
- affected 6.7.35
- affected 6.9.1
What to do
Exploitation: The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is 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-2022-20849)Record last updated .