CVE-2026-33797 (GCVE-0-2026-33797)

Vulnerability from cvelistv5 – Published: 2026-04-09 21:31 – Updated: 2026-04-23 20:08
VLAI
Title
Junos OS and Junos OS Evolved: An attacker sending a specific genuine BGP packet causes a BGP reset
Summary
An Improper Input Validation vulnerability in Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, adjacent attacker, sending a specific genuine BGP packet in an already established BGP session to reset only that session causing a Denial of Service (DoS). An attacker repeatedly sending the packet will sustain the Denial of Service (DoS).This issue affects Junos OS: * 25.2 versions before 25.2R2 This issue does not affect Junos OS versions before 25.2R1. This issue affects Junos OS Evolved: * 25.2-EVO versions before 25.2R2-EVO This issue does not affect Junos OS Evolved versions before 25.2R1-EVO. eBGP and iBGP are affected. IPv4 and IPv6 are affected.
Severity
7.4 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/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:Green
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-13 17:40 UTC
CWE
  • CWE-20 - Improper Input Validation
Assigner
References
Impacted products
Vendor Product Version CPE status
Juniper Networks Junos OS Affected: 25.2 , < 25.2R2 (semver)
Unaffected: 0 , < 25.2R1 (semver)
guessed Create a notification for this product.
Juniper Networks Junos OS Evolved Affected: 25.2 , < 25.2R2-EVO (semver)
Unaffected: 0 , < 25.2R1-EVO (semver)
guessed Create a notification for this product.
Date Public
2026-04-08 16:00
Show details on NVD website
To clipboard 

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                  "value": "An Improper Input Validation vulnerability in Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, adjacent attacker, sending a specific genuine BGP packet in an already established BGP session to reset only that session causing a Denial of Service (DoS).\u003cbr\u003e\u003cbr\u003eAn attacker repeatedly sending the packet will sustain the Denial of Service (DoS).\u003cp\u003eThis issue affects Junos OS:\u003c/p\u003e\u003cul\u003e\u003cli\u003e25.2 versions before 25.2R2\u003c/li\u003e\u003c/ul\u003eThis issue does not affect Junos OS versions before 25.2R1.\u003cbr\u003e\u003cbr\u003eThis issue affects Junos OS Evolved: \u003cbr\u003e\u003cul\u003e\u003cli\u003e25.2-EVO versions before 25.2R2-EVO\u003c/li\u003e\u003c/ul\u003eThis issue does not affect Junos OS Evolved versions before 25.2R1-EVO.\u003cbr\u003e\u003cbr\u003eeBGP and iBGP are affected.\u003cbr\u003eIPv4 and IPv6 are affected.\u0026nbsp;\u003cbr\u003e"
                }
              ],
              "value": "An Improper Input Validation vulnerability in Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, adjacent attacker, sending a specific genuine BGP packet in an already established BGP session to reset only that session causing a Denial of Service (DoS).\n\nAn attacker repeatedly sending the packet will sustain the Denial of Service (DoS).This issue affects Junos OS:\n\n  *  25.2 versions before 25.2R2\n\n\nThis issue does not affect Junos OS versions before 25.2R1.\n\nThis issue affects Junos OS Evolved: \n  *  25.2-EVO versions before 25.2R2-EVO\n\n\nThis issue does not affect Junos OS Evolved versions before 25.2R1-EVO.\n\neBGP and iBGP are affected.\nIPv4 and IPv6 are affected."
            }
          ],
          "exploits": [
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              "lang": "en",
              "supportingMedia": [
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                  "value": "Juniper SIRT is not aware of any malicious exploitation of this vulnerability."
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                "attackVector": "ADJACENT_NETWORK",
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                "integrityImpact": "NONE",
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                "scope": "CHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
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                "privilegesRequired": "NONE",
                "providerUrgency": "GREEN",
                "subAvailabilityImpact": "LOW",
                "subConfidentialityImpact": "NONE",
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                "vulnerabilityResponseEffort": "MODERATE"
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              ]
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          ],
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              "descriptions": [
                {
                  "cweId": "CWE-20",
                  "description": "CWE-20 Improper Input Validation",
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          "providerMetadata": {
            "dateUpdated": "2026-04-23T20:08:35.655Z",
            "orgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968",
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              "tags": [
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              "url": "https://kb.juniper.net/JSA107850"
            },
            {
              "tags": [
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              "supportingMedia": [
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                  "value": "The following software releases have been updated to resolve this specific issue:\u003cbr\u003eJunos OS:\u0026nbsp;25.2R2,\u0026nbsp;25.4R1, and all subsequent releases.\u003cbr\u003eJunos OS Evolved: 25.2R2-EVO, 25.4R1-EVO, and all subsequent releases."
                }
              ],
              "value": "The following software releases have been updated to resolve this specific issue:\nJunos OS:\u00a025.2R2,\u00a025.4R1, and all subsequent releases.\nJunos OS Evolved: 25.2R2-EVO, 25.4R1-EVO, and all subsequent releases."
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          ],
          "source": {
            "advisory": "JSA107850",
            "defect": [
              "1893316"
            ],
            "discovery": "INTERNAL"
          },
          "title": "Junos OS and Junos OS Evolved: An attacker sending a specific genuine BGP packet causes a BGP reset",
          "workarounds": [
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              "lang": "en",
              "supportingMedia": [
                {
                  "base64": false,
                  "type": "text/html",
                  "value": "There are no known workarounds for this issue.\u003cbr\u003e"
                }
              ],
              "value": "There are no known workarounds for this issue."
            }
          ],
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      },
      "cveMetadata": {
        "assignerOrgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968",
        "assignerShortName": "juniper",
        "cveId": "CVE-2026-33797",
        "datePublished": "2026-04-09T21:31:22.902Z",
        "dateReserved": "2026-03-23T19:46:13.673Z",
        "dateUpdated": "2026-04-23T20:08:35.655Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
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    }
  }
}



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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.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.