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CVE-2026-21901

A NULL Pointer Dereference vulnerability in the management daemon (mgd) of Juniper Networks Junos OS and Junos OS Evolved allows a local, high-privileged attacker setting or deactivating a specific SSH configuration parameter to create a Denial of Service (DoS). A local high-privileged user configuring or deactivating a specific 'system services ssh' configuration parameter can exploit a null pointer dereference in one of the functions used by SSH. The function attempts to dereference a null po
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:a633937e7cefd027d519d6bc74053ad5dabbff8b7b1c52f958f0efacd1169d60
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
2

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"defaultStatus":"unaffected","product":"Junos OS","vendor":"Juniper Networks","versions":[{"lessThan":"22.3R3-S5","status":"affected","version":"22.3","versionType":"custom"},{"lessThan":"22.4R3-S10","status":"affected","version":"22.4","versionType":"custom"},{"lessThan":"23.2R2-S7","status":"affected","version":"23.2","versionType":"custom"},{"lessThan":"23.4R2-S8","status":"affected","version":"23.4","versionType":"custom"},{"lessThan":"22.3R1","status":"unaffected","version":"0","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b9537c68777e8ea65651aae43300a9ffb6a2fe8daa38a667436c16e43881b9cc · sha256:32c1f6c56798dfb2… · /containers/cna/affected/0

{"defaultStatus":"unaffected","product":"Junos OS Evolved","vendor":"Juniper Networks","versions":[{"lessThan":"23.2R2-S7-EVO","status":"affected","version":"23.2","versionType":"custom"},{"lessThan":"23.4R2-S8-EVO","status":"affected","version":"23.4","versionType":"custom"},{"lessThan":"22.3R1-EVO","status":"unaffected","version":"0","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b9537c68777e8ea65651aae43300a9ffb6a2fe8daa38a667436c16e43881b9cc · sha256:32c1f6c56798dfb2… · /containers/cna/affected/1
cvss · 2 assertions

{"metric":{"Automatable":"YES","Recovery":"AUTOMATIC","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"LOCAL","baseScore":6.7,"baseSeverity":"MEDIUM","privilegesRequired":"HIGH","providerUrgency":"GREEN","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"DIFFUSE","vectorString":"CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/AU:Y/R:A/V:D/RE:M/U:Green","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact…

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:b9537c68777e8ea65651aae43300a9ffb6a2fe8daa38a667436c16e43881b9cc · sha256:32c1f6c56798dfb2… · /containers/cna/metrics/1/cvssV4_0

{"metric":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":4.4,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"HIGH","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:b9537c68777e8ea65651aae43300a9ffb6a2fe8daa38a667436c16e43881b9cc · sha256:32c1f6c56798dfb2… · /containers/cna/metrics/0/cvssV3_1

Affected products and versions

2 source assertions
{"defaultStatus":"unaffected","product":"Junos OS","vendor":"Juniper Networks","versions":[{"lessThan":"22.3R3-S5","status":"affected","version":"22.3","versionType":"custom"},{"lessThan":"22.4R3-S10","status":"affected","version":"22.4","versionType":"custom"},{"lessThan":"23.2R2-S7","status":"affected","version":"23.2","versionType":"custom"},{"lessThan":"23.4R2-S8","status":"affected","version":"23.4","versionType":"custom"},{"lessThan":"22.3R1","status":"unaffected","version":"0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b9537c68777e8ea65651aae43300a9ffb6a2fe8daa38a667436c16e43881b9cc · sha256:32c1f6c56798dfb2… · /containers/cna/affected/0
{"defaultStatus":"unaffected","product":"Junos OS Evolved","vendor":"Juniper Networks","versions":[{"lessThan":"23.2R2-S7-EVO","status":"affected","version":"23.2","versionType":"custom"},{"lessThan":"23.4R2-S8-EVO","status":"affected","version":"23.4","versionType":"custom"},{"lessThan":"22.3R1-EVO","status":"unaffected","version":"0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b9537c68777e8ea65651aae43300a9ffb6a2fe8daa38a667436c16e43881b9cc · sha256:32c1f6c56798dfb2… · /containers/cna/affected/1

Provider-owned CVSS observations

2 source assertions
{"metric":{"Automatable":"YES","Recovery":"AUTOMATIC","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"LOCAL","baseScore":6.7,"baseSeverity":"MEDIUM","privilegesRequired":"HIGH","providerUrgency":"GREEN","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"DIFFUSE","vectorString":"CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/AU:Y/R:A/V:D/RE:M/U:Green","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:b9537c68777e8ea65651aae43300a9ffb6a2fe8daa38a667436c16e43881b9cc · sha256:32c1f6c56798dfb2… · /containers/cna/metrics/1/cvssV4_0
{"metric":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":4.4,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"HIGH","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:b9537c68777e8ea65651aae43300a9ffb6a2fe8daa38a667436c16e43881b9cc · sha256:32c1f6c56798dfb2… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-476","description":"CWE-476 NULL Pointer Dereference","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:b9537c68777e8ea65651aae43300a9ffb6a2fe8daa38a667436c16e43881b9cc · sha256:32c1f6c56798dfb2… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"tags":["third-party-advisory"],"url":"https://github.com/orangecertcc/security-research/security/advisories/GHSA-g4f7-w2rc-hpj6"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b9537c68777e8ea65651aae43300a9ffb6a2fe8daa38a667436c16e43881b9cc · sha256:32c1f6c56798dfb2… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://github.com/orangecertcc/security-research/security/advisories/GHSA-g4f7-w2rc-hpj6"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b9537c68777e8ea65651aae43300a9ffb6a2fe8daa38a667436c16e43881b9cc · sha256:32c1f6c56798dfb2… · /containers/adp/0/references/0
{"tags":["vendor-advisory"],"url":"https://supportportal.juniper.net/JSA110072"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b9537c68777e8ea65651aae43300a9ffb6a2fe8daa38a667436c16e43881b9cc · sha256:32c1f6c56798dfb2… · /containers/cna/references/1

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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