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{"bugzilla": {"description": "exim: use-after-free in receive_msg function via vectors involving BDAT commands", "id": "1517680", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1517680"}, "csaw": false, "cvss3": {"cvss3_base_score": "9.8", "cvss3_scoring_vector": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-416", "details": ["The receive_msg function in receive.c in the SMTP daemon in Exim 4.88 and 4.89 allows remote attackers to execute arbitrary code or cause a denial of service (use-after-free) via vectors involving BDAT commands."], "mitigation": {"lang": "en:us", "value": "if you are running Exim 4.88 or newer, then in the main section of your Exim configuration, set:\nchunking_advertise_hosts =\nThis disables advertising the ESMTP CHUNKING extension, making the BDAT verb unavailable and avoids letting an attacker apply the logic."}, "name": "CVE-2017-16943", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Not affected", "package_name": "exim", "product_name": "Red Hat Enterprise Linux 5"}], "public_date": "2017-11-23T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2017-16943\nhttps://nvd.nist.gov/vuln/detail/CVE-2017-16943"], "threat_severity": "Critical"}