CVE-2026-21911 (GCVE-0-2026-21911)

Vulnerability from cvelistv5 – Published: 2026-01-15 20:23 – Updated: 2026-01-15 20:51
VLAI
Title
Junos OS Evolved: Flapping management interface causes MAC learning on label-switched interfaces to stop
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.
Severity
6.5 (Medium)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.1 (High)
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/AU:Y/R:A/V:C/RE:M/U:Amber
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
Impacted products
Vendor Product Version
Juniper Networks Junos OS Evolved Affected: 0 , < 21.4R3-S7-EVO (semver)
Affected: 22.2 , < 22.2R3-S4-EVO (semver)
Affected: 22.3 , < 22.3R3-S3-EVO (semver)
Affected: 22.4 , < 22.4R3-S2-EVO (semver)
Affected: 23.2 , < 23.2R2-S1-EVO (semver)
Affected: 23.4 , < 23.4R1-S2-EVO, 23.4R2-EVO (semver)
Create a notification for this product.
Date Public
2026-01-14 17:00
Show details on NVD website
To clipboard 

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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-21911\",\"sourceIdentifier\":\"sirt@juniper.net\",\"published\":\"2026-01-15T21:16:07.110\",\"lastModified\":\"2026-06-17T10:19:08.587\",\"vulnStatus\":\"Analyzed\",\"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.\"},{\"lang\":\"es\",\"value\":\"Una vulnerabilidad de c\u00e1lculo incorrecto en el demonio del protocolo de control de capa 2 (l2cpd) de Juniper Networks Junos OS Evolved permite a un atacante adyacente a la red no autenticado que alterna la interfaz de gesti\u00f3n detener el aprendizaje de nuevas MAC a trav\u00e9s de interfaces conmutadas por etiquetas (LSI) mientras genera una inundaci\u00f3n de registros, lo que resulta en un alto uso de la CPU.\\n\\nCuando se observa el problema, se generar\u00e1 el siguiente mensaje de registro:\\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\\nEste problema afecta a Junos OS Evolved:\\n\\n  *  todas las versiones anteriores a 21.4R3-S7-EVO,\\n  *  desde 22.2 anteriores a 22.2R3-S4-EVO,\\n  *  desde 22.3 anteriores a 22.3R3-S3-EVO,\\n  *  desde 22.4 anteriores a 22.4R3-S2-EVO,\\n  *  desde 23.2 anteriores a 23.2R2-S1-EVO,\\n  *  desde 23.4 anteriores a 23.4R1-S2-EVO, 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\"https://supportportal.juniper.net/JSA106010\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"https://kb.juniper.net/JSA106010\", \"tags\": [\"vendor-advisory\"]}], \"workarounds\": [{\"lang\": \"en\", \"value\": \"There are no known workarounds for this issue.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"There are no known workarounds for this issue.\u003cbr\u003e\", \"base64\": false}]}], \"x_generator\": {\"engine\": \"Vulnogram 0.1.0-dev\"}, \"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.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cspan style=\\\"background-color: rgb(255, 255, 255);\\\"\u003eAn Incorrect Calculation vulnerability in the Layer 2 Control\\n\\n\u003cspan style=\\\"background-color: rgb(255, 255, 255);\\\"\u003eProtocol \u003c/span\u003e\\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\u0026nbsp;\u003c/span\u003eflood of logs, resulting in high CPU usage.\u003cbr\u003e\u003cbr\u003eWhen the issue is seen, the following log message will be generated:\u003cbr\u003e\u003cbr\u003e\u003ctt\u003eop: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,\u003c/tt\u003e \u003cp\u003e\u003cbr\u003e\u003c/p\u003e\u003cp\u003eThis issue affects Junos OS Evolved:\u0026nbsp;\u003c/p\u003e\u003cul\u003e\u003cli\u003eall versions before 21.4R3-S7-EVO,\u0026nbsp;\u003c/li\u003e\u003cli\u003efrom 22.2 before 22.2R3-S4-EVO,\u0026nbsp;\u003c/li\u003e\u003cli\u003efrom 22.3 before 22.3R3-S3-EVO,\u0026nbsp;\u003c/li\u003e\u003cli\u003efrom 22.4 before 22.4R3-S2-EVO,\u0026nbsp;\u003c/li\u003e\u003cli\u003efrom 23.2 before 23.2R2-S1-EVO,\u0026nbsp;\u003c/li\u003e\u003cli\u003efrom 23.4 before 23.4R1-S2-EVO, 23.4R2-EVO.\u003c/li\u003e\u003c/ul\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-682\", \"description\": \"CWE-682 Incorrect Calculation\"}]}], \"configurations\": [{\"lang\": \"en\", \"value\": \"This issue affects label-switched interfaces configured for VPLS. For example:\\n\\n[routing-instances \u003cname\u003e instance-type vpls]\\n[routing-instances \u003cname\u003e protocols vpls]\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"This issue affects label-switched interfaces configured for VPLS. For example:\u003cbr\u003e\u003cbr\u003e\u003ctt\u003e[routing-instances \u0026lt;name\u0026gt; instance-type vpls]\u003cbr\u003e[routing-instances \u0026lt;name\u0026gt; protocols vpls]\u003c/tt\u003e\", \"base64\": false}]}], \"providerMetadata\": {\"orgId\": \"8cbe9d5a-a066-4c94-8978-4b15efeae968\", \"shortName\": \"juniper\", \"dateUpdated\": \"2026-01-15T20:23:54.924Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-21911\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-01-15T20:51:32.531Z\", \"dateReserved\": \"2026-01-05T17:32:48.710Z\", \"assignerOrgId\": \"8cbe9d5a-a066-4c94-8978-4b15efeae968\", \"datePublished\": \"2026-01-15T20:23:54.924Z\", \"assignerShortName\": \"juniper\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

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.