{"schemaVersion":3,"id":"CVE-2022-22204","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"An Improper Release of Memory Before Removing Last Reference vulnerability in the Session Initiation Protocol (SIP) Application Layer Gateway (ALG) of Juniper Networks Junos OS allows unauthenticated network-based attacker to cause a partial Denial of Service (DoS). On all MX and SRX platforms, if the SIP ALG is enabled, receipt of a specific SIP packet will create a stale SIP entry. Sustained receipt of such packets will cause the SIP call table to eventually fill up and cause a DoS for all SIP traffic. The SIP call usage can be monitored by \"show security alg sip calls\". To be affected the SIP ALG needs to be enabled, either implicitly / by default or by way of configuration. Please verify on SRX with: user@host> show security alg status | match sip SIP : Enabled Please verify on MX whether the following is configured: [ services ... rule <rule-name> (term <term-name>) from/match application/application-set <name> ] where either a. name = junos-sip or an application or application-set refers to SIP: b. [ applications application <name> application-protocol sip ] or c. [ applications application-set <name> application junos-sip ] This issue affects Juniper Networks Junos OS on SRX Series and MX Series: 20.4 versions prior to 20.4R3-S2; 21.1 versions prior to 21.1R3-S2; 21.2 versions prior to 21.2R2-S2; 21.2 versions prior to 21.2R3; 21.3 versions prior to 21.3R2; 21.4 versions prior to 21.4R2. This issue does not affect Juniper Networks Junos OS versions prior to 20.4R1. Juniper SIRT is not aware of any malicious exploitation of this vulnerability.","dates":{"published":"2022-07-20T14:12:08.333Z","modified":"2024-09-16T16:17:32.073Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":5.3,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":5.3,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":5.3,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.0072,"percentile":0.53067,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":0.02100000000000001,"baselineDate":"2026-09-19T00:00:00.000Z","baselineScore":0.00699},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00699,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00699,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00699,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00699,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00699,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00699,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00699,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00699,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00699,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00699,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00699,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00699,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00699,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00699,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00699,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00699,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00699,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00699,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00699,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00699,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00699,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00699,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.0072,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.0072,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.0072,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.0072,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.0072,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.0072,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.0072,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.0072,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.0072,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.0072,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.0072,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.0072,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.0072,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.0072,"percentile":0.53067}],"last30":[{"date":"2026-09-19T00:00:00.000Z","score":0.00699,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00699,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00699,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00699,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00699,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00699,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00699,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00699,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00699,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00699,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00699,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00699,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00699,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00699,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00699,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00699,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00699,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.0072,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.0072,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.0072,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.0072,"percentile":null},{"date":"2026-10-10T00:00:00.000Z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