{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-21907","assignerOrgId":"8cbe9d5a-a066-4c94-8978-4b15efeae968","state":"PUBLISHED","assignerShortName":"juniper","dateReserved":"2026-01-05T17:32:48.710Z","datePublished":"2026-01-15T20:21:11.010Z","dateUpdated":"2026-01-15T21:12:31.198Z"},"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Junos Space","vendor":"Juniper Networks","versions":[{"lessThan":"24.1R5","status":"affected","version":"0","versionType":"semver"}]}],"datePublic":"2026-01-14T17:00:00.000Z","descriptions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"<span style=\"background-color: rgb(255, 255, 255);\">A Use of a Broken or Risky Cryptographic Algorithm vulnerability in the&nbsp;<span style=\"background-color: rgb(255, 255, 255);\">TLS/SSL server</span>&nbsp;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. T<span style=\"background-color: rgb(255, 255, 255);\">hese ciphers also do not support Perfect Forward Secrecy (PFS),&nbsp;affecting the long-term confidentiality of encrypted communications.</span></span><p>This issue affects all versions of Junos Space before 24.1R5.</p>"}],"value":"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."}],"exploits":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"Juniper SIRT is not aware of any malicious exploitation of this vulnerability."}],"value":"Juniper SIRT is not aware of any malicious exploitation of this vulnerability."}],"metrics":[{"cvssV3_1":{"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"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]},{"cvssV4_0":{"Automatable":"YES","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":8.2,"baseSeverity":"HIGH","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/AU:Y/RE:M/U:Green","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"NONE","vulnerabilityResponseEffort":"MODERATE"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-327","description":"CWE-327 Use of a Broken or Risky Cryptographic Algorithm","lang":"en","type":"CWE"}]}],"providerMetadata":{"orgId":"8cbe9d5a-a066-4c94-8978-4b15efeae968","shortName":"juniper","dateUpdated":"2026-01-15T20:21:11.010Z"},"references":[{"tags":["vendor-advisory"],"url":"https://supportportal.juniper.net/JSA106006"},{"tags":["vendor-advisory"],"url":"https://kb.juniper.net/JSA106006"}],"solutions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"The following software releases have been updated to resolve this specific issue: Junos Space 24.1R5 and all subsequent releases."}],"value":"The following software releases have been updated to resolve this specific issue: Junos Space 24.1R5 and all subsequent releases."}],"source":{"advisory":"JSA106006","defect":["1892735"],"discovery":"INTERNAL"},"title":"Junos Space: TLS/SSL server supports use of static key ciphers (ssl-static-key-ciphers)","workarounds":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"There are no direct workarounds for this issue.<br><br>Ensure any clients connecting to the device do not allow negotiation of&nbsp;static RSA key exchange."}],"value":"There are no direct workarounds for this issue.\n\nEnsure any clients connecting to the device do not allow negotiation of static RSA key exchange."}],"x_generator":{"engine":"Vulnogram 0.1.0-dev"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-01-15T21:12:27.062334Z","id":"CVE-2026-21907","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-01-15T21:12:31.198Z"}}]}}