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TI-2022-05408 Aliases CVE-2022-20849GHSA-r2p4-pwjj-hqr4

Cisco IOS XR Software Broadband Network Gateway PPPoE Denial of Service Vulnerability

Priority LOW 27CWE-391Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
—
Confidentiality · integrity · availability
None · None · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

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 .

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00277 20th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
CiscoCisco IOS XR Software6.5.3; 6.6.1; 6.5.15; 7.0.1; 6.6.25; 6.6.2; 6.5.1; 6.5.2; 7.1.1; 7.0.90; 6.6.3; 6.7.1; 7.0.2; 7.1.15; 7.1.2; 7.2.1; 6.7.2; 7.1.25; 6.6.4; 7.3.1; 7.1.3; 6.7.3; 7.4.1; 7.2.2; 6.8.1; 7.3.2; 7.5.1; 7.3.3; 6.8.2; 7.3.4; 7.4.2; 6.7.35; 6.9.1—No fix listedCNA
  • Cisco IOS XR Software VendorCisco Affected 6.5.3; 6.6.1; 6.5.15; 7.0.1; 6.6.25; 6.6.2; 6.5.1; 6.5.2; 7.1.1; 7.0.90; 6.6.3; 6.7.1; 7.0.2; 7.1.15; 7.1.2; 7.2.1; 6.7.2; 7.1.25; 6.6.4; 7.3.1; 7.1.3; 6.7.3; 7.4.1; 7.2.2; 6.8.1; 7.3.2; 7.5.1; 7.3.3; 6.8.2; 7.3.4; 7.4.2; 6.7.35; 6.9.1 Fixed in — No fix listed CNA

CPE configurations NVD · 44

CPEVersionsRoleVendor
cpe:2.3:o:cisco:ios_xr:6.5.1:*:*:*:*:*:*:*6.5.1VulnerableCisco
cpe:2.3:o:cisco:ios_xr:6.5.2:*:*:*:*:*:*:*6.5.2VulnerableCisco
cpe:2.3:o:cisco:ios_xr:6.5.3:*:*:*:*:*:*:*6.5.3VulnerableCisco
cpe:2.3:o:cisco:ios_xr:6.5.15:*:*:*:*:*:*:*6.5.15VulnerableCisco
cpe:2.3:o:cisco:ios_xr:6.6.1:*:*:*:*:*:*:*6.6.1VulnerableCisco
cpe:2.3:o:cisco:ios_xr:6.6.2:*:*:*:*:*:*:*6.6.2VulnerableCisco
cpe:2.3:o:cisco:ios_xr:6.6.3:*:*:*:*:*:*:*6.6.3VulnerableCisco
cpe:2.3:o:cisco:ios_xr:6.6.4:*:*:*:*:*:*:*6.6.4VulnerableCisco
cpe:2.3:o:cisco:ios_xr:6.6.25:*:*:*:*:*:*:*6.6.25VulnerableCisco
cpe:2.3:o:cisco:ios_xr:6.7.1:*:*:*:*:*:*:*6.7.1VulnerableCisco
  • cpe:2.3:o:cisco:ios_xr:6.5.1:*:*:*:*:*:*:* Versions 6.5.1 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xr:6.5.2:*:*:*:*:*:*:* Versions 6.5.2 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xr:6.5.3:*:*:*:*:*:*:* Versions 6.5.3 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xr:6.5.15:*:*:*:*:*:*:* Versions 6.5.15 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xr:6.6.1:*:*:*:*:*:*:* Versions 6.6.1 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xr:6.6.2:*:*:*:*:*:*:* Versions 6.6.2 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xr:6.6.3:*:*:*:*:*:*:* Versions 6.6.3 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xr:6.6.4:*:*:*:*:*:*:* Versions 6.6.4 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xr:6.6.25:*:*:*:*:*:*:* Versions 6.6.25 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xr:6.7.1:*:*:*:*:*:*:* Versions 6.7.1 Vulnerable ·Cisco
Show 34 more CPE
CPEVersionsRoleVendor
cpe:2.3:o:cisco:ios_xr:6.7.2:*:*:*:*:*:*:*6.7.2VulnerableCisco
cpe:2.3:o:cisco:ios_xr:6.7.3:*:*:*:*:*:*:*6.7.3VulnerableCisco
cpe:2.3:o:cisco:ios_xr:6.7.35:*:*:*:*:*:*:*6.7.35VulnerableCisco
cpe:2.3:o:cisco:ios_xr:6.8.1:*:*:*:*:*:*:*6.8.1VulnerableCisco
cpe:2.3:o:cisco:ios_xr:6.8.2:*:*:*:*:*:*:*6.8.2VulnerableCisco
cpe:2.3:o:cisco:ios_xr:6.9.1:*:*:*:*:*:*:*6.9.1VulnerableCisco
cpe:2.3:o:cisco:ios_xr:7.0.1:*:*:*:*:*:*:*7.0.1VulnerableCisco
cpe:2.3:o:cisco:ios_xr:7.0.2:*:*:*:*:*:*:*7.0.2VulnerableCisco
cpe:2.3:o:cisco:ios_xr:7.0.90:*:*:*:*:*:*:*7.0.90VulnerableCisco
cpe:2.3:o:cisco:ios_xr:7.1.1:*:*:*:*:*:*:*7.1.1VulnerableCisco
cpe:2.3:o:cisco:ios_xr:7.1.2:*:*:*:*:*:*:*7.1.2VulnerableCisco
cpe:2.3:o:cisco:ios_xr:7.1.3:*:*:*:*:*:*:*7.1.3VulnerableCisco
cpe:2.3:o:cisco:ios_xr:7.1.15:*:*:*:*:*:*:*7.1.15VulnerableCisco
cpe:2.3:o:cisco:ios_xr:7.1.25:*:*:*:*:*:*:*7.1.25VulnerableCisco
cpe:2.3:o:cisco:ios_xr:7.2.1:*:*:*:*:*:*:*7.2.1VulnerableCisco
cpe:2.3:o:cisco:ios_xr:7.2.2:*:*:*:*:*:*:*7.2.2VulnerableCisco
cpe:2.3:o:cisco:ios_xr:7.3.1:*:*:*:*:*:*:*7.3.1VulnerableCisco
cpe:2.3:o:cisco:ios_xr:7.3.2:*:*:*:*:*:*:*7.3.2VulnerableCisco
cpe:2.3:o:cisco:ios_xr:7.3.3:*:*:*:*:*:*:*7.3.3VulnerableCisco
cpe:2.3:o:cisco:ios_xr:7.3.4:*:*:*:*:*:*:*7.3.4VulnerableCisco
cpe:2.3:o:cisco:ios_xr:7.4.1:*:*:*:*:*:*:*7.4.1VulnerableCisco
cpe:2.3:o:cisco:ios_xr:7.4.2:*:*:*:*:*:*:*7.4.2VulnerableCisco
cpe:2.3:o:cisco:ios_xr:7.5.1:*:*:*:*:*:*:*7.5.1VulnerableCisco
cpe:2.3:h:cisco:asr_9006:-:*:*:*:*:*:*:*not specified by NVDRunning onCisco
cpe:2.3:h:cisco:asr_9010:-:*:*:*:*:*:*:*not specified by NVDRunning onCisco
cpe:2.3:h:cisco:asr_9901:-:*:*:*:*:*:*:*not specified by NVDRunning onCisco
cpe:2.3:h:cisco:asr_9902:-:*:*:*:*:*:*:*not specified by NVDRunning onCisco
cpe:2.3:h:cisco:asr_9903:-:*:*:*:*:*:*:*not specified by NVDRunning onCisco
cpe:2.3:h:cisco:asr_9904:-:*:*:*:*:*:*:*not specified by NVDRunning onCisco
cpe:2.3:h:cisco:asr_9906:-:*:*:*:*:*:*:*not specified by NVDRunning onCisco
cpe:2.3:h:cisco:asr_9910:-:*:*:*:*:*:*:*not specified by NVDRunning onCisco
cpe:2.3:h:cisco:asr_9912:-:*:*:*:*:*:*:*not specified by NVDRunning onCisco
cpe:2.3:h:cisco:asr_9922:-:*:*:*:*:*:*:*not specified by NVDRunning onCisco
cpe:2.3:h:cisco:ios_xrv_9000:-:*:*:*:*:*:*:*not specified by NVDRunning onCisco
  • cpe:2.3:o:cisco:ios_xr:6.7.2:*:*:*:*:*:*:* Versions 6.7.2 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xr:6.7.3:*:*:*:*:*:*:* Versions 6.7.3 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xr:6.7.35:*:*:*:*:*:*:* Versions 6.7.35 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xr:6.8.1:*:*:*:*:*:*:* Versions 6.8.1 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xr:6.8.2:*:*:*:*:*:*:* Versions 6.8.2 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xr:6.9.1:*:*:*:*:*:*:* Versions 6.9.1 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xr:7.0.1:*:*:*:*:*:*:* Versions 7.0.1 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xr:7.0.2:*:*:*:*:*:*:* Versions 7.0.2 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xr:7.0.90:*:*:*:*:*:*:* Versions 7.0.90 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xr:7.1.1:*:*:*:*:*:*:* Versions 7.1.1 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xr:7.1.2:*:*:*:*:*:*:* Versions 7.1.2 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xr:7.1.3:*:*:*:*:*:*:* Versions 7.1.3 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xr:7.1.15:*:*:*:*:*:*:* Versions 7.1.15 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xr:7.1.25:*:*:*:*:*:*:* Versions 7.1.25 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xr:7.2.1:*:*:*:*:*:*:* Versions 7.2.1 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xr:7.2.2:*:*:*:*:*:*:* Versions 7.2.2 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xr:7.3.1:*:*:*:*:*:*:* Versions 7.3.1 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xr:7.3.2:*:*:*:*:*:*:* Versions 7.3.2 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xr:7.3.3:*:*:*:*:*:*:* Versions 7.3.3 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xr:7.3.4:*:*:*:*:*:*:* Versions 7.3.4 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xr:7.4.1:*:*:*:*:*:*:* Versions 7.4.1 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xr:7.4.2:*:*:*:*:*:*:* Versions 7.4.2 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xr:7.5.1:*:*:*:*:*:*:* Versions 7.5.1 Vulnerable ·Cisco
  • cpe:2.3:h:cisco:asr_9006:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
  • cpe:2.3:h:cisco:asr_9010:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
  • cpe:2.3:h:cisco:asr_9901:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
  • cpe:2.3:h:cisco:asr_9902:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
  • cpe:2.3:h:cisco:asr_9903:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
  • cpe:2.3:h:cisco:asr_9904:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
  • cpe:2.3:h:cisco:asr_9906:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
  • cpe:2.3:h:cisco:asr_9910:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
  • cpe:2.3:h:cisco:asr_9912:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
  • cpe:2.3:h:cisco:asr_9922:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
  • cpe:2.3:h:cisco:ios_xrv_9000:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2022-20849
  2. 2026-10-03 Alias added: GHSA-r2p4-pwjj-hqr4

References

Advisory 1

  • TI-2020-02680 Cisco IOS XR Software Cisco Discovery Protocol Format String Vulnerability KEVCVSS 3.1HIGH 8.8
  • TI-2018-00135 Memory corruption in Cisco IOS, IOS XE, and IOS XR KEVCVSS 3.1HIGH 8.8
  • TI-2020-03113 Cisco IOS XR Software DVMRP Memory Exhaustion Vulnerabilities KEVCVSS 3.1HIGH 8.6
  • TI-2020-03110 Cisco IOS XR Software DVMRP Memory Exhaustion Vulnerability KEVCVSS 3.1HIGH 8.6
  • TI-2018-00142 Memory corruption in Cisco IOS, IOS XE, and IOS XR KEVCVSS 3.1HIGH 8.0
  • TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
See all 199 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences