{"id":"CVE-2026-103391","aliases":["EUVD-2026-112226","GHSA-mg4c-h4g5-47fv"],"status":"published","title":"Session Smart Router: An attacker-controlled TCP option causes an out-of-bounds write when using the TCP proxy feature","description":"An Out-of-bounds Write vulnerability in the SSR TCP proxy/optimization path in Juniper Networks Session Smart Router allows an attacker to corrupt forwarded packet data and potentially cause a data-plane crash via a transit TCP packet with a crafted TCP option length.","severity":{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00207,"percentile":0.10862,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-787"],"published":"2026-10-28T16:33:32Z","modified":"2026-11-06T18:32:25Z","products":[{"vendor":"juniper networks","product":"session smart router"}],"references":[{"url":"https://supportportal.juniper.net/JSA112183","tags":["vendor-advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-103391"},{"url":"https://github.com/advisories/GHSA-mg4c-h4g5-47fv"}],"sources":{"cve":[{"id":"CVE-2026-103391","title":"Session Smart Router: An attacker-controlled TCP option causes an out-of-bounds write when using the TCP proxy feature","description":"An Out-of-bounds Write vulnerability in the SSR TCP proxy/optimization path in Juniper Networks Session Smart Router allows an attacker to corrupt forwarded packet data and potentially cause a data-plane crash via a transit TCP packet with a crafted TCP option length.","status":"published","published":"2026-10-28T16:33:32.354Z","modified":"2026-11-06T18:32:25.034Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-787"],"updated_at":"2026-11-06T19:59:18.98792Z"}],"euvd":[{"id":"EUVD-2026-112226","description":"An Out-of-bounds Write vulnerability in the SSR TCP proxy/optimization path in Juniper Networks Session Smart Router allows an attacker to corrupt forwarded packet data and potentially cause a data-plane crash via a transit TCP packet with a crafted TCP option length.","status":"published","published":"2026-10-28T16:33:32Z","modified":"2026-11-06T18:32:25Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium"}],"updated_at":"2026-11-06T19:05:52.672747Z"}],"ghsa":[{"id":"GHSA-mg4c-h4g5-47fv","title":"An Out-of-bounds Write vulnerability in the SSR TCP proxy/optimization path in Juniper Networks...","description":"An Out-of-bounds Write vulnerability in the SSR TCP proxy/optimization path in Juniper Networks Session Smart Router allows an attacker to corrupt forwarded packet data and potentially cause a data-plane crash via a transit TCP packet with a crafted TCP option length.","status":"published","published":"2026-10-28T18:32:02Z","modified":"2026-10-28T18:32:09Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T15:14:35.861264Z"}],"nvd":[{"id":"CVE-2026-103391","description":"An Out-of-bounds Write vulnerability in the SSR TCP proxy/optimization path in Juniper Networks Session Smart Router allows an attacker to corrupt forwarded packet data and potentially cause a data-plane crash via a transit TCP packet with a crafted TCP option length.","status":"published","published":"2026-10-28T17:17:22.163Z","modified":"2026-11-06T19:17:04.9Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-787"],"updated_at":"2026-11-06T22:02:15.550386Z"}]}}