CVE-2023-36849

Summary

An Improper Check or Handling of Exceptional Conditions vulnerability in the Layer-2 control protocols daemon (l2cpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated adjacent attacker to cause a Denial of Service (DoS).

When a malformed LLDP packet is received, l2cpd will crash and restart. The impact of the l2cpd crash is reinitialization of STP protocols (RSTP, MSTP or VSTP), and MVRP and ERP. Also, if any services depend on LLDP state (like PoE or VoIP device recognition), then these will also be affected. Continued receipt of such packets will lead to a sustained Denial of Service.

This issue affects: Juniper Networks Junos OS 21.4 versions prior to 21.4R3-S3; 22.1 versions prior to 22.1R3-S3; 22.2 versions prior to 22.2R2-S1, 22.2R3; 22.3 versions prior to 22.3R2.

Juniper Networks Junos OS Evolved 21.4-EVO versions prior to 21.4R3-S2-EVO; 22.1-EVO versions prior to 22.1R3-S3-EVO; 22.2-EVO versions prior to 22.2R2-S1-EVO, 22.2R3-EVO; 22.3-EVO versions prior to 22.3R2-EVO.

Affected Software

VendorProductVersion RangeStatus
Juniper NetworksJunos OS21.4 < 21.4R3-S3affected
Juniper NetworksJunos OS22.1 < 22.1R3-S3affected
Juniper NetworksJunos OS22.2 < 22.2R2-S1, 22.2R3affected
Juniper NetworksJunos OS22.3 < 22.3R2affected
Juniper NetworksJunos OS Evolved21.4 < 21.4R3-S2-EVOaffected
Juniper NetworksJunos OS Evolved22.1 < 22.1R3-S3-EVOaffected
Juniper NetworksJunos OS Evolved22.2 < 22.2R2-S1-EVO, 22.2R3-EVOaffected
Juniper NetworksJunos OS Evolved22.3 < 22.3R2-EVOaffected

Weaknesses

  • CWE-703: CWE-703 Improper Check or Handling of Exceptional Conditions
  • Denial of Service (DoS)

Workarounds

There are no available workarounds for this issue.

If LLDP and its services are not required, this issue can be mitigated by disabling LLDP.

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References