무엇인가
Redis·Memcached 등 인메모리 저장소 포트입니다.
왜 위험한가
대부분 기본 무인증이라 외부 노출 시 세션·키를 읽고 쓰거나(RCE) 데이터를 삭제당할 수 있습니다.
어떻게 해야 하나
bind 127.0.0.1/사설망 + requirepass·ACL 로 잠그고, 방화벽에서 내부망만 허용하세요.
내 서버에서 열려 있는지 확인
Linux
ss -ltnp 'sport = :11211'Memcached 의 알려진 취약점
| CVE | 제목 | CVSS | 악용 | EPSS | 공개일 |
|---|---|---|---|---|---|
| CVE-2016-8704 | An integer overflow in the process_bin_append_prepend function in Memcached, which is responsible for processi... | 9.8 | — | 2017-01-07 | |
| CVE-2016-8705 | Multiple integer overflows in process_bin_update function in Memcached, which is responsible for processing mu... | 9.8 | — | 2017-01-07 | |
| CVE-2023-46853 | In Memcached before 1.6.22, an off-by-one error exists when processing proxy requests in proxy mode, if \n is... | 9.8 | — | 2023-10-27 | |
| CVE-2016-8706 | An integer overflow in process_bin_sasl_auth function in Memcached, which is responsible for authentication co... | 8.1 | — | 2017-01-07 | |
| CVE-2026-47783 | In memcached before 1.6.42, username data for SASL password database authentication has a timing side channel... | 8.1 | — | 2026-05-20 | |
| CVE-2026-47784 | In memcached before 1.6.42, password data for SASL password database authentication has a timing side channel... | 8.1 | — | 2026-05-20 | |
| CVE-2017-9951 | The try_read_command function in memcached.c in memcached before 1.4.39 allows remote attackers to cause a den... | 7.5 | — | 2017-07-17 | |
| CVE-2018-1000115 | Memcached version 1.5.5 contains an Insufficient Control of Network Message Volume (Network Amplification, CWE... | 7.5 | — | 2018-03-05 | |
| CVE-2018-1000127 | memcached version prior to 1.4.37 contains an Integer Overflow vulnerability in items.c:item_free() that can r... | 7.5 | — | 2018-03-14 | |
| CVE-2019-11596 | In memcached before 1.5.14, a NULL pointer dereference was found in the "lru mode" and "lru temp_ttl" commands... | 7.5 | — | 2019-04-29 | |
| CVE-2019-15026 | memcached 1.5.16, when UNIX sockets are used, has a stack-based buffer over-read in conn_to_str in memcached.c... | 7.5 | — | 2019-08-30 | |
| CVE-2020-10931 | Memcached 1.6.x before 1.6.2 allows remote attackers to cause a denial of service (daemon crash) via a crafted... | 7.5 | — | 2020-03-24 |
내 서버의 버전을 직접 추적하세요
InfraGuard 는 모든 서버에 설치된 소프트웨어 버전을 수집하고, 알려진 취약점이 있는 버전을 알려 줍니다. 자체 호스팅이라 데이터가 내 네트워크를 벗어나지 않습니다.