{"id":"CVE-2020-11503","aliases":["EUVD-2020-3856","GHSA-m76g-2f52-hcj3"],"status":"published","title":"A heap-based buffer overflow in the awarrensmtp component of Sophos XG Firewall v17.5 MR11 and...","description":"A heap-based buffer overflow in the awarrensmtp component of Sophos XG Firewall v17.5 MR11 and older potentially allows an attacker to run arbitrary code remotely.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.01444,"percentile":0.73446,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-787"],"published":"2020-06-18T15:25:29Z","modified":"2026-06-17T02:50:18Z","products":[{"vendor":"sophos","product":"sfos"}],"references":[{"url":"https://community.sophos.com/b/security-blog/posts/advisory-potential-rce-through-heap-overflow-in-awarrensmtp-cve-2020-11503","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-11503"},{"url":"https://github.com/advisories/GHSA-m76g-2f52-hcj3"}],"sources":{"cve":[{"id":"CVE-2020-11503","description":"A heap-based buffer overflow in the awarrensmtp component of Sophos XG Firewall v17.5 MR11 and older potentially allows an attacker to run arbitrary code remotely.","status":"published","published":"2020-06-18T15:25:29Z","modified":"2024-08-04T11:35:12.73Z","updated_at":"2026-11-02T14:35:57.352161Z"}],"euvd":[{"id":"EUVD-2020-3856","description":"A heap-based buffer overflow in the awarrensmtp component of Sophos XG Firewall v17.5 MR11 and older potentially allows an attacker to run arbitrary code remotely.","status":"published","published":"2020-06-18T15:25:29Z","modified":"2024-08-04T11:35:12Z","updated_at":"2026-11-03T03:07:46.270701Z"}],"ghsa":[{"id":"GHSA-m76g-2f52-hcj3","title":"A heap-based buffer overflow in the awarrensmtp component of Sophos XG Firewall v17.5 MR11 and...","description":"A heap-based buffer overflow in the awarrensmtp component of Sophos XG Firewall v17.5 MR11 and older potentially allows an attacker to run arbitrary code remotely.","status":"published","published":"2022-05-24T17:20:51Z","modified":"2023-01-29T05:03:03Z","updated_at":"2026-11-02T14:45:14.198561Z"}],"nvd":[{"id":"CVE-2020-11503","description":"A heap-based buffer overflow in the awarrensmtp component of Sophos XG Firewall v17.5 MR11 and older potentially allows an attacker to run arbitrary code remotely.","status":"published","published":"2020-06-18T16:15:13.043Z","modified":"2026-06-17T02:50:18.24Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:06:07.249892Z"}]}}