FKIE_CVE-2026-21911

Vulnerability from fkie_nvd - Published: 2026-01-15 21:16 - Updated: 2026-01-23 16:59
Severity ?
6.5 (Medium) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
An Incorrect Calculation vulnerability in the Layer 2 Control Protocol Daemon (l2cpd) of Juniper Networks Junos OS Evolved allows an unauthenticated network-adjacent attacker flapping the management interface to cause the learning of new MACs over label-switched interfaces (LSI) to stop while generating a flood of logs, resulting in high CPU usage. When the issue is seen, the following log message will be generated: op:1 flag:0x6 mac:xx:xx:xx:xx:xx:xx bd:2 ifl:13302 reason:0(REASON_NONE) i-op:6(INTRNL_OP_HW_FORCE_DELETE) status:10 lstatus:10 err:26(GETIFBD_VALIDATE_FAILED) err-reason 4(IFBD_VALIDATE_FAIL_EPOCH_MISMATCH) hw_wr:0x4 ctxsync:0 fwdsync:0 rtt-id:51 p_ifl:0 fwd_nh:0 svlbnh:0 event:- smask:0x100000000 dmask:0x0 mplsmask 0x1 act:0x5800 extf:0x0 pfe-id 0 hw-notif-ifl 13302 programmed-ifl 4294967295 pseudo-vtep underlay-ifl-idx 0 stack:GET_MAC, ALLOCATE_MAC, GET_IFL, GET_IFF, GET_IFBD, STOP, This issue affects Junos OS Evolved:  * all versions before 21.4R3-S7-EVO,  * from 22.2 before 22.2R3-S4-EVO,  * from 22.3 before 22.3R3-S3-EVO,  * from 22.4 before 22.4R3-S2-EVO,  * from 23.2 before 23.2R2-S1-EVO,  * from 23.4 before 23.4R1-S2-EVO, 23.4R2-EVO.
References
sirt@juniper.nethttps://kb.juniper.net/JSA106010Vendor Advisory
sirt@juniper.nethttps://supportportal.juniper.net/JSA106010Vendor Advisory
Impacted products
Vendor Product Version
juniper junos_os_evolved *
juniper junos_os_evolved 21.4
juniper junos_os_evolved 21.4
juniper junos_os_evolved 21.4
juniper junos_os_evolved 21.4
juniper junos_os_evolved 21.4
juniper junos_os_evolved 21.4
juniper junos_os_evolved 21.4
juniper junos_os_evolved 21.4
juniper junos_os_evolved 21.4
juniper junos_os_evolved 21.4
juniper junos_os_evolved 21.4
juniper junos_os_evolved 21.4
juniper junos_os_evolved 21.4
juniper junos_os_evolved 21.4
juniper junos_os_evolved 22.2
juniper junos_os_evolved 22.2
juniper junos_os_evolved 22.2
juniper junos_os_evolved 22.2
juniper junos_os_evolved 22.2
juniper junos_os_evolved 22.2
juniper junos_os_evolved 22.2
juniper junos_os_evolved 22.2
juniper junos_os_evolved 22.2
juniper junos_os_evolved 22.2
juniper junos_os_evolved 22.2
juniper junos_os_evolved 22.3
juniper junos_os_evolved 22.3
juniper junos_os_evolved 22.3
juniper junos_os_evolved 22.3
juniper junos_os_evolved 22.3
juniper junos_os_evolved 22.3
juniper junos_os_evolved 22.3
juniper junos_os_evolved 22.3
juniper junos_os_evolved 22.3
juniper junos_os_evolved 22.3
juniper junos_os_evolved 22.4
juniper junos_os_evolved 22.4
juniper junos_os_evolved 22.4
juniper junos_os_evolved 22.4
juniper junos_os_evolved 22.4
juniper junos_os_evolved 22.4
juniper junos_os_evolved 22.4
juniper junos_os_evolved 22.4
juniper junos_os_evolved 22.4
juniper junos_os_evolved 23.2
juniper junos_os_evolved 23.2
juniper junos_os_evolved 23.2
juniper junos_os_evolved 23.2
juniper junos_os_evolved 23.2
juniper junos_os_evolved 23.4
juniper junos_os_evolved 23.4
juniper junos_os_evolved 23.4
juniper junos_os_evolved 23.4
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "An Incorrect Calculation vulnerability in the Layer 2 Control\n\nProtocol \n\n Daemon (l2cpd) of Juniper Networks Junos OS Evolved allows an unauthenticated network-adjacent attacker flapping the management interface to cause the learning of new MACs over label-switched interfaces (LSI) to stop while generating a\u00a0flood of logs, resulting in high CPU usage.\n\nWhen the issue is seen, the following log message will be generated:\n\nop:1 flag:0x6 mac:xx:xx:xx:xx:xx:xx bd:2 ifl:13302 reason:0(REASON_NONE) i-op:6(INTRNL_OP_HW_FORCE_DELETE) status:10 lstatus:10 err:26(GETIFBD_VALIDATE_FAILED) err-reason 4(IFBD_VALIDATE_FAIL_EPOCH_MISMATCH) hw_wr:0x4 ctxsync:0 fwdsync:0  rtt-id:51 p_ifl:0  fwd_nh:0 svlbnh:0 event:- smask:0x100000000 dmask:0x0 mplsmask 0x1 act:0x5800 extf:0x0 pfe-id 0 hw-notif-ifl 13302 programmed-ifl 4294967295 pseudo-vtep underlay-ifl-idx 0 stack:GET_MAC, ALLOCATE_MAC, GET_IFL, GET_IFF, GET_IFBD, STOP, \n\n\nThis issue affects Junos OS Evolved:\u00a0\n\n  *  all versions before 21.4R3-S7-EVO,\u00a0\n  *  from 22.2 before 22.2R3-S4-EVO,\u00a0\n  *  from 22.3 before 22.3R3-S3-EVO,\u00a0\n  *  from 22.4 before 22.4R3-S2-EVO,\u00a0\n  *  from 23.2 before 23.2R2-S1-EVO,\u00a0\n  *  from 23.4 before 23.4R1-S2-EVO, 23.4R2-EVO."
    }
  ],
  "id": "CVE-2026-21911",
  "lastModified": "2026-01-23T16:59:03.777",
  "metrics": {
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          "attackVector": "ADJACENT_NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6,
        "source": "sirt@juniper.net",
        "type": "Primary"
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          "Recovery": "AUTOMATIC",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "ADJACENT",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 7.1,
          "baseSeverity": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "AMBER",
          "subAvailabilityImpact": "LOW",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "CONCENTRATED",
          "vectorString": "CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:A/V:C/RE:M/U:Amber",
          "version": "4.0",
          "vulnAvailabilityImpact": "HIGH",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "MODERATE"
        },
        "source": "sirt@juniper.net",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-01-15T21:16:07.110",
  "references": [
    {
      "source": "sirt@juniper.net",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://kb.juniper.net/JSA106010"
    },
    {
      "source": "sirt@juniper.net",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://supportportal.juniper.net/JSA106010"
    }
  ],
  "sourceIdentifier": "sirt@juniper.net",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-682"
        }
      ],
      "source": "sirt@juniper.net",
      "type": "Primary"
    }
  ]
}


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Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.