CWE-755

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              "value": "Improper Handling of Exceptional Conditions vulnerability in Erlang OTP \u003ctt\u003eerts\u003c/tt\u003e (\u003ctt\u003eepmd\u003c/tt\u003e) allows an unauthenticated remote attacker to permanently terminate the Erlang Port Mapper Daemon (epmd) via connection slot exhaustion.\u003cp\u003eThe \u003ctt\u003edo_accept\u003c/tt\u003e function in \u003ctt\u003eerts/epmd/src/epmd_srv.c\u003c/tt\u003e calls \u003ctt\u003eepmd_cleanup_exit()\u003c/tt\u003e when \u003ctt\u003eaccept(2)\u003c/tt\u003e returns \u003ctt\u003eEMFILE\u003c/tt\u003e (per-process file descriptor limit reached) or \u003ctt\u003eENFILE\u003c/tt\u003e (system-wide file descriptor limit reached), rather than treating these as recoverable conditions. An attacker can exhaust epmd\u0027s file descriptor slots by holding many TCP connections open while periodically sending a single byte to reset the idle timeout, then causing \u003ctt\u003eaccept(2)\u003c/tt\u003e to return \u003ctt\u003eEMFILE\u003c/tt\u003e, which kills the daemon. epmd has no per-source-IP connection cap, making the attack feasible from a single source.\u003c/p\u003e\u003cp\u003eOn Debian/Ubuntu default packaging the impact is amplified: the systemd unit inherits a low file descriptor soft limit, and repeated daemon deaths trigger systemd\u0027s start-rate-limit, permanently failing both \u003ctt\u003eepmd.service\u003c/tt\u003e and \u003ctt\u003eepmd.socket\u003c/tt\u003e and requiring manual operator intervention to recover.\u003c/p\u003e\u003cp\u003eThis issue affects OTP from OTP 17.0 before OTP\u0026nbsp;29.0.4, OTP\u0026nbsp;28.5.0.4 and OTP\u0026nbsp;27.3.4.15.\u003c/p\u003e"
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          "value": "Improper Handling of Exceptional Conditions vulnerability in Erlang OTP erts (epmd) allows an unauthenticated remote attacker to permanently terminate the Erlang Port Mapper Daemon (epmd) via connection slot exhaustion.\n\nThe do_accept function in erts/epmd/src/epmd_srv.c calls epmd_cleanup_exit() when accept(2) returns EMFILE (per-process file descriptor limit reached) or ENFILE (system-wide file descriptor limit reached), rather than treating these as recoverable conditions. An attacker can exhaust epmd\u0027s file descriptor slots by holding many TCP connections open while periodically sending a single byte to reset the idle timeout, then causing accept(2) to return EMFILE, which kills the daemon. epmd has no per-source-IP connection cap, making the attack feasible from a single source.\n\nOn Debian/Ubuntu default packaging the impact is amplified: the systemd unit inherits a low file descriptor soft limit, and repeated daemon deaths trigger systemd\u0027s start-rate-limit, permanently failing both epmd.service and epmd.socket and requiring manual operator intervention to recover.\n\nThis issue affects OTP from OTP 17.0 before OTP\u00a029.0.4, OTP\u00a028.5.0.4 and OTP\u00a027.3.4.15."
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