Vulnerability-Lookup

FKIE_CVE-2026-21907

Vulnerability from fkie_nvd - Published: 2026-01-15 21:16 - Updated: 2026-06-17 10:19

Severity

5.9 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Summary

A Use of a Broken or Risky Cryptographic Algorithm vulnerability in the TLS/SSL server of Juniper Networks Junos Space allows the use of static key ciphers (ssl-static-key-ciphers), reducing the confidentiality of on-path traffic communicated across the connection. These ciphers also do not support Perfect Forward Secrecy (PFS), affecting the long-term confidentiality of encrypted communications.This issue affects all versions of Junos Space before 24.1R5.

References

	URL	Tags
	sirt@juniper.net	https://kb.juniper.net/JSA106006	Vendor Advisory
	sirt@juniper.net	https://supportportal.juniper.net/JSA106006	Vendor Advisory

Impacted products

Vendor	Product	Version
juniper	junos_space	*
juniper	junos_space	24.1
juniper	junos_space	24.1
juniper	junos_space	24.1
juniper	junos_space	24.1

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Junos Space",
          "vendor": "Juniper Networks",
          "versions": [
            {
              "lessThan": "24.1R5",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "sirt@juniper.net"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:juniper:junos_space:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "2EC090A9-634B-4AA2-916F-7548AF71FF76",
              "versionEndExcluding": "24.1",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:juniper:junos_space:24.1:r1:*:*:*:*:*:*",
              "matchCriteriaId": "0566970C-0E9B-4566-9920-C7C436A4243D",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:juniper:junos_space:24.1:r2:*:*:*:*:*:*",
              "matchCriteriaId": "A2AA399D-5A7D-45B8-B774-D69054DFA4D3",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:juniper:junos_space:24.1:r3:*:*:*:*:*:*",
              "matchCriteriaId": "57CC4E1A-23AA-4B4A-8690-5EEDCBEC4BBE",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:juniper:junos_space:24.1:r4:*:*:*:*:*:*",
              "matchCriteriaId": "3F39EC68-9DBB-4A30-BB44-1A26020079CB",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A Use of a Broken or Risky Cryptographic Algorithm vulnerability in the\u00a0TLS/SSL server\u00a0of Juniper Networks Junos Space allows the use of static key ciphers (ssl-static-key-ciphers), reducing the confidentiality of on-path traffic communicated across the connection. These ciphers also do not support Perfect Forward Secrecy (PFS),\u00a0affecting the long-term confidentiality of encrypted communications.This issue affects all versions of Junos Space before 24.1R5."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad de Uso de un algoritmo criptogr\u00e1fico roto o arriesgado en el servidor TLS/SSL de Juniper Networks Junos Space permite el uso de cifrados de clave est\u00e1tica (ssl-static-key-ciphers), reduciendo la confidencialidad del tr\u00e1fico en ruta comunicado a trav\u00e9s de la conexi\u00f3n. Estos cifrados tampoco soportan Perfect Forward Secrecy (PFS), afectando la confidencialidad a largo plazo de las comunicaciones cifradas. Este problema afecta a todas las versiones de Junos Space anteriores a 24.1R5."
    }
  ],
  "id": "CVE-2026-21907",
  "lastModified": "2026-06-17T10:19:07.937",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.9,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 3.6,
        "source": "sirt@juniper.net",
        "type": "Secondary"
      }
    ],
    "cvssMetricV40": [
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        "cvssData": {
          "Automatable": "YES",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "PRESENT",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 8.2,
          "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": "GREEN",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "LOW",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:L/SI:N/SA:N/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:X/V:X/RE:M/U:Green",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
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          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "MODERATE"
        },
        "source": "sirt@juniper.net",
        "type": "Secondary"
      }
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    "ssvcV203": [
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-21907",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-01-15T21:12:27.062334Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-01-15T21:16:06.357",
  "references": [
    {
      "source": "sirt@juniper.net",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://kb.juniper.net/JSA106006"
    },
    {
      "source": "sirt@juniper.net",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://supportportal.juniper.net/JSA106006"
    }
  ],
  "sourceIdentifier": "sirt@juniper.net",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-327"
        }
      ],
      "source": "sirt@juniper.net",
      "type": "Secondary"
    }
  ]
}

CVE-2026-21907 (GCVE-0-2026-21907)

Vulnerability from cvelistv5 – Published: 2026-01-15 20:21 – Updated: 2026-01-15 21:12

Title

Junos Space: TLS/SSL server supports use of static key ciphers (ssl-static-key-ciphers)

Summary

Severity

5.9 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

8.2 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:L/SI:N/SA:N/AU:Y/RE:M/U:Green

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-01-15 21:12 UTC

CWE

CWE-327 - Use of a Broken or Risky Cryptographic Algorithm

Assigner

juniper mitre root

References

2 references

URL	Tags
https://supportportal.juniper.net/JSA106006	vendor-advisory
https://kb.juniper.net/JSA106006	vendor-advisory

Impacted products

1 product

Vendor	Product	Version
Juniper Networks	Junos Space	Affected: 0 , < 24.1R5 (semver)

Date Public

2026-01-14 17:00

Show details on NVD website

JSON

To clipboard

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                "timestamp": "2026-01-15T21:12:27.062334Z",
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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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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.