CVE-2026-21907

{"id": "CVE-2026-21907", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "sirt@juniper.net", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.9, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 3.6, "exploitabilityScore": 2.2}], "cvssMetricV40": [{"type": "Secondary", "source": "sirt@juniper.net", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 8.2, "Automatable": "YES", "attackVector": "NETWORK", "baseSeverity": "HIGH", "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", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "GREEN", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "NONE", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "LOW", "vulnConfidentialityImpact": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "MODERATE", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "published": "2026-01-15T21:16:06.357", "references": [{"url": "https://kb.juniper.net/JSA106006", "tags": ["Vendor Advisory"], "source": "sirt@juniper.net"}, {"url": "https://supportportal.juniper.net/JSA106006", "tags": ["Vendor Advisory"], "source": "sirt@juniper.net"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "sirt@juniper.net", "description": [{"lang": "en", "value": "CWE-327"}]}], "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."}], "lastModified": "2026-01-23T20:02:29.660", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:juniper:junos_space:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "2EC090A9-634B-4AA2-916F-7548AF71FF76", "versionEndExcluding": "24.1"}, {"criteria": "cpe:2.3:a:juniper:junos_space:24.1:r1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "0566970C-0E9B-4566-9920-C7C436A4243D"}, {"criteria": "cpe:2.3:a:juniper:junos_space:24.1:r2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "A2AA399D-5A7D-45B8-B774-D69054DFA4D3"}, {"criteria": "cpe:2.3:a:juniper:junos_space:24.1:r3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "57CC4E1A-23AA-4B4A-8690-5EEDCBEC4BBE"}, {"criteria": "cpe:2.3:a:juniper:junos_space:24.1:r4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "3F39EC68-9DBB-4A30-BB44-1A26020079CB"}], "operator": "OR"}]}], "sourceIdentifier": "sirt@juniper.net"}