High
Security advisory
Memcached version 1.5.5 contains an Insufficient Control of Network Message Volume (Network Amplification, CWE-406) vulnerability in the UDP support of the memcached server that can result in denial of service via network flood (traffic amplification of 1:50,000 has been reported by reliable sources). This attack appear to be exploitable via network connectivity to port 11211 UDP. This vulnerability appears to have been fixed in 1.5.6 due to the disabling of the UDP protocol by default.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2018-1000115
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 12:16 UTC · Revision 1
Source evidence
Memcached version 1.5.5 contains an Insufficient Control of Network Message Volume (Network Amplification, CWE-406) vulnerability in the UDP support of the memcached server that can result in denial of service via network flood (traffic amplification of 1:50,000 has been reported by reliable sources). This attack appear to be exploitable via network connectivity to port 11211 UDP. This vulnerability appears to have been fixed in 1.5.6 due to the disabling of the UDP protocol by default.
osv:CVE-2018-1000115
Complete source record
{
"id": "04a55b469ba6446c178e2d0af3cf358e4a09220bbb3848f47414a3ca9de4fba3",
"url": "https://osv.dev/vulnerability/CVE-2018-1000115",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2018-1000115",
"summary": "Memcached version 1.5.5 contains an Insufficient Control of Network Message Volume (Network Amplification, CWE-406) vulnerability in the UDP support of the memcached server that can result in denial of service via network flood (traffic amplification of 1:50,000 has been reported by reliable sources). This attack appear to be exploitable via network connectivity to port 11211 UDP. This vulnerability appears to have been fixed in 1.5.6 due to the disabling of the UDP protocol by default.",
"evidence": "osv:CVE-2018-1000115",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2018-1000115",
"aliases": [
"CVE-2018-1000115"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/memcached/memcached",
"type": "GIT",
"events": [
{
"introduced": "5c0face158f1d0f9c6add22b8f027e468bbe5368"
},
{
"last_affected": "5c0face158f1d0f9c6add22b8f027e468bbe5368"
},
{
"fixed": "dbb7a8af90054bf4ef51f5814ef7ceb17d83d974"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:memcached:memcached:1.5.5:*:*:*:*:*:*:*",
"range": [
{
"introduced": "1.5.5"
},
{
"last_affected": "1.5.5"
}
],
"source": "CPE_STRING"
},
{
"range": [
{
"fixed": "dbb7a8af90054bf4ef51f5814ef7ceb17d83d974"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
"versions": [
"1.5.5"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-1000115.json",
"vanir_signatures": [
{
"id": "CVE-2018-1000115-0ac4bbcb",
"digest": {
"length": 30373,
"function_hash": "193722961698032371527947248956219288832"
},
"source": "https://github.com/memcached/memcached/commit/dbb7a8af90054bf4ef51f5814ef7ceb17d83d974",
"target": {
"file": "memcached.c",
"function": "main"
},
"deprecated": false,
"signature_type": "Function",
"signature_version": "v1"
},
{
"id": "CVE-2018-1000115-9852e524",
"digest": {
"length": 1933,
"function_hash": "330998889739120987815784656563466875832"
},
"source": "https://github.com/memcached/memcached/commit/dbb7a8af90054bf4ef51f5814ef7ceb17d83d974",
"target": {
"file": "memcached.c",
"function": "settings_init"
},
"deprecated": false,
"signature_type": "Function",
"signature_version": "v1"
},
{
"id": "CVE-2018-1000115-99dc29a1",
"digest": {
"threshold": 0.9,
"line_hashes": [
"99844338321918568212206164351620081210",
"61301066329899020218707063201727086268",
"51627476998667589567435647497634809851",
"175203149859822716800958277195115406735",
"226042521575162426575001747920677518870",
"128900771787833317458517062138927870659",
"100185069658857430426761737085813262082",
"203231507774883639279930381864538137391",
"144245093527256529598901711107644974092",
"338915189309399925542868337167611278247"
]
},
"source": "https://github.com/memcached/memcached/commit/dbb7a8af90054bf4ef51f5814ef7ceb17d83d974",
"target": {
"file": "memcached.c"
},
"deprecated": false,
"signature_type": "Line",
"signature_version": "v1"
}
],
"vanir_signatures_modified": "2026-10-20T13:25:26Z"
}
}
],
"modified": "2026-10-20T13:25:26.920441952Z",
"provider": "osv",
"references": [
"https://access.redhat.com/errata/RHBA-2018:2140",
"https://access.redhat.com/errata/RHSA-2018:1593",
"https://access.redhat.com/errata/RHSA-2018:1627",
"https://access.redhat.com/errata/RHSA-2018:2331",
"https://access.redhat.com/errata/RHSA-2018:2857",
"https://blogs.akamai.com/2018/03/memcached-fueled-13-tbps-attacks.html",
"https://github.com/memcached/memcached/wiki/ReleaseNotes156",
"https://twitter.com/dormando/status/968579781729009664",
"https://usn.ubuntu.com/3588-1/",
"https://www.debian.org/security/2018/dsa-4218",
"https://www.synology.com/support/security/Synology_SA_18_07",
"https://github.com/memcached/memcached/issues/348",
"https://github.com/memcached/memcached/commit/dbb7a8af90054bf4ef51f5814ef7ceb17d83d974",
"https://www.exploit-db.com/exploits/44264/",
"https://www.exploit-db.com/exploits/44265/"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:17.10:*:*:*:*:*:*:*"
],
"vendor_product": "canonical:ubuntu_linux",
"extracted_events": [
{
"range": [
{
"introduced": "14.04"
},
{
"last_affected": "14.04"
},
{
"introduced": "16.04"
},
{
"last_affected": "16.04"
},
{
"introduced": "17.10"
},
{
"last_affected": "17.10"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*",
"cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"
],
"vendor_product": "debian:debian_linux",
"extracted_events": [
{
"range": [
{
"introduced": "8.0"
},
{
"last_affected": "8.0"
},
{
"introduced": "9.0"
},
{
"last_affected": "9.0"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:a:redhat:openstack:10:*:*:*:*:*:*:*",
"cpe:2.3:a:redhat:openstack:11:*:*:*:*:*:*:*",
"cpe:2.3:a:redhat:openstack:12:*:*:*:*:*:*:*",
"cpe:2.3:a:redhat:openstack:8:*:*:*:*:*:*:*",
"cpe:2.3:a:redhat:openstack:9:*:*:*:*:*:*:*"
],
"vendor_product": "redhat:openstack",
"extracted_events": [
{
"range": [
{
"introduced": "8"
},
{
"last_affected": "8"
},
{
"introduced": "9"
},
{
"last_affected": "9"
},
{
"introduced": "10"
},
{
"last_affected": "10"
},
{
"introduced": "11"
},
{
"last_affected": "11"
},
{
"introduced": "12"
},
{
"last_affected": "12"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2018-1000115",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 387665,
"published_at": "2018-03-05T14:29:00.203+00:00"
}