NVD / CVE Program· CNA mitre

CVE-2018-1000115: Memcached version 1.5.5 contains an Insufficient Control of Network Message Volume (Network Amplification, CWE-406) vulnerability in the UDP

Noroxi assessment

Priority: This week (action score 60/100)

A ready-made attack module is public (Metasploit); exploiting it takes no special expertise.
A ready-made attack tool exists and the flaw can be exploited over the network without an account, so priority is at least “This week”.
Probability of exploitation in the next 30 days: 88.1% (FIRST EPSS); higher than 99.7% of all records.
Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
Fixed version: n/a n/a 1.5.6.

Don’t wait for the next maintenance window. Upgrade to n/a n/a 1.5.6 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 7.5 · v3.0—Weaponized Fix available

Published: Mar 5, 2018
Updated: Jun 16, 2026
EPSS: 88.1% · 99th percentile
CWE: CWE-400

Report tools

JSON

Action score

This week

Don’t wait for the next maintenance window.

CVSS: 30 / 40 · 7.5 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 26 / 30 · 88.1%
Ready-made attack tool: 4 / 60 · floor: at least 60

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Weaponized exploit exists
A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
memcached	memcached	cpe:2.3:a:memcached:memcached
canonical	ubuntu linux	cpe:2.3:o:canonical:ubuntu_linux
debian	debian linux	cpe:2.3:o:debian:debian_linux
redhat	openstack	cpe:2.3:a:redhat:openstack

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

canonical ubuntu linux14.04
canonical ubuntu linux16.04
canonical ubuntu linux17.10
debian debian linux8.0
debian debian linux9.0
memcached memcached1.5.5
redhat openstack10
redhat openstack11
redhat openstack12
redhat openstack8
redhat openstack9

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
Alpine:v3.4	memcached	before 1.4.33-r2	1.4.33-r2
Alpine:v3.6	memcached	before 1.4.36-r2	1.4.36-r2
Debian:12	memcached	before 1.5.6-1	1.5.6-1
Debian:8	memcached	before 1.4.21-1.1+deb8u2	1.4.21-1.1+deb8u2
Debian:9	memcached	before 1.4.33-1+deb9u1	1.4.33-1+deb9u1
openSUSE:Tumbleweed	memcached	before 1.6.9-2.3	1.6.9-2.3
Red Hat:openstack-director:8::el7	instack-undercloud	before 0:2.2.7-13.el7ost	0:2.2.7-13.el7ost
Red Hat:openstack-director:8::el7	openstack-tripleo-heat-templates	before 0:0.8.14-42.el7ost	0:0.8.14-42.el7ost
Red Hat:openstack-director:8::el7	openstack-tripleo-heat-templates-kilo	before 0:0.8.14-42.el7ost	0:0.8.14-42.el7ost
Red Hat:openstack-director:9::el7	instack-undercloud	before 0:4.0.0-18.el7ost	0:4.0.0-18.el7ost
Red Hat:openstack-director:9::el7	openstack-tripleo-heat-templates	before 0:2.0.0-65.el7ost	0:2.0.0-65.el7ost
Red Hat:openstack-director:9::el7	openstack-tripleo-heat-templates-liberty	before 0:2.0.0-65.el7ost	0:2.0.0-65.el7ost
Red Hat:openstack:10::el7	openstack-tripleo-heat-templates	before 0:5.3.10-1.el7ost	0:5.3.10-1.el7ost
Red Hat:openstack:10::el7	puppet-tripleo	before 0:5.6.8-6.el7ost	0:5.6.8-6.el7ost
Red Hat:openstack:11::el7	openstack-tripleo-heat-templates	before 0:6.2.12-2.el7ost	0:6.2.12-2.el7ost
Red Hat:openstack:11::el7	puppet-tripleo	before 0:6.5.10-3.el7ost	0:6.5.10-3.el7ost
Red Hat:openstack:12::el7	instack-undercloud	before 0:7.4.12-1.el7ost	0:7.4.12-1.el7ost
Red Hat:openstack:12::el7	openstack-tripleo-common	before 0:7.6.13-3.el7ost	0:7.6.13-3.el7ost
Red Hat:openstack:12::el7	openstack-tripleo-common-container-base	before 0:7.6.13-3.el7ost	0:7.6.13-3.el7ost
Red Hat:openstack:12::el7	openstack-tripleo-common-containers	before 0:7.6.13-3.el7ost	0:7.6.13-3.el7ost
Red Hat:openstack:12::el7	openstack-tripleo-common-devtools	before 0:7.6.13-3.el7ost	0:7.6.13-3.el7ost
Red Hat:openstack:12::el7	openstack-tripleo-heat-templates	before 0:7.0.12-8.el7ost	0:7.0.12-8.el7ost
Red Hat:openstack:12::el7	openstack-tripleo-image-elements	before 0:7.0.5-1.el7ost	0:7.0.5-1.el7ost
Red Hat:openstack:12::el7	openstack-tripleo-puppet-elements	before 0:7.0.7-1.el7ost	0:7.0.7-1.el7ost

+55

Same product

memcached: all records

Other highest-scoring records for the same primary product.

CVE-2016-8706An integer overflow in process_bin_sasl_auth function in Memcached, which is responsible for authentication commands of Memcached binary pro
46Plan
CVE-2016-8704An integer overflow in the process_bin_append_prepend function in Memcached, which is responsible for processing multiple commands of Memcac
46Plan
CVE-2016-8705Multiple integer overflows in process_bin_update function in Memcached, which is responsible for processing multiple commands of Memcached b
45Plan

Published before and after this one in the same product

← EarlierCVE-2013-7291Jan 13, 2014 · memcached before 1.4.17, when running in verbose mode, allows remote attackers to cause a denial of service (crash) via a request that trigg
7Monitor
← EarlierCVE-2017-9951Jul 17, 2017 · The try_read_command function in memcached.c in memcached before 1.4.39 allows remote attackers to cause a denial of service (segmentation f
31Monitor
Later →CVE-2018-1000127Mar 13, 2018 · memcached version prior to 1.4.37 contains an Integer Overflow vulnerability in items.c:item_free() that can result in data corruption and d
31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
n/a n/a	1.5.6 · description	Vendor (CNA)
alpine:memcached	1.4.33-r2 · Alpine:v3.4	Package registry (OSV)
debian:memcached	1.5.6-1 · Debian:12	Package registry (OSV)
opensuse:memcached	1.6.9-2.3 · openSUSE:Tumbleweed	Package registry (OSV)
red hat:instack-undercloud	0:4.0.0-18.el7ost · Red Hat:openstack-director:9::el7	Package registry (OSV)
red hat:openstack-tripleo-common	0:7.6.13-3.el7ost · Red Hat:openstack:12::el7	Package registry (OSV)
red hat:openstack-tripleo-common-container-base	0:7.6.13-3.el7ost · Red Hat:openstack:12::el7	Package registry (OSV)
red hat:openstack-tripleo-common-containers	0:7.6.13-3.el7ost · Red Hat:openstack:12::el7	Package registry (OSV)
red hat:openstack-tripleo-common-devtools	0:7.6.13-3.el7ost · Red Hat:openstack:12::el7	Package registry (OSV)
red hat:openstack-tripleo-heat-templates	0:2.0.0-65.el7ost · Red Hat:openstack-director:9::el7	Package registry (OSV)
red hat:openstack-tripleo-heat-templates-liberty	0:2.0.0-65.el7ost · Red Hat:openstack-director:9::el7	Package registry (OSV)
red hat:openstack-tripleo-image-elements	0:7.0.5-1.el7ost · Red Hat:openstack:12::el7	Package registry (OSV)
red hat:openstack-tripleo-puppet-elements	0:7.0.7-1.el7ost · Red Hat:openstack:12::el7	Package registry (OSV)
red hat:os-net-config	0:7.3.6-1.el7ost · Red Hat:openstack:12::el7	Package registry (OSV)
red hat:puppet-aodh	0:11.4.0-2.el7ost · Red Hat:openstack:12::el7	Package registry (OSV)
red hat:puppet-tripleo	0:5.6.8-6.el7ost · Red Hat:openstack:10::el7	Package registry (OSV)
suse:ansible	2.2.3.0-12.2 · SUSE:OpenStack Cloud 7	Package registry (OSV)
suse:crowbar-core	4.0+git.1580209654.1d112d31f-9.66.5 · SUSE:OpenStack Cloud 7	Package registry (OSV)
suse:crowbar-ha	4.0+git.1521473535.67d2302-4.28.1 · SUSE:OpenStack Cloud 7	Package registry (OSV)
suse:crowbar-openstack	4.0+git.1522325467.43e431f91-9.30.1 · SUSE:OpenStack Cloud 7	Package registry (OSV)
suse:grafana	4.6.5-1.14.1 · SUSE:OpenStack Cloud 7	Package registry (OSV)
suse:keepalived	2.0.19-1.8.1 · SUSE:OpenStack Cloud 7	Package registry (OSV)
suse:kibana	4.6.3-5.1 · SUSE:OpenStack Cloud 7	Package registry (OSV)
suse:memcached	1.5.17-3.6.1 · SUSE:OpenStack Cloud 7	Package registry (OSV)
suse:monasca-installer	20180608_12.47-12.1 · SUSE:OpenStack Cloud 7	Package registry (OSV)
suse:openstack-dashboard-theme-SUSE	2016.2-5.12.4 · SUSE:OpenStack Cloud 7	Package registry (OSV)
suse:openstack-manila	3.0.1~dev30-4.12.2 · SUSE:OpenStack Cloud 7	Package registry (OSV)
suse:openstack-manila-doc	3.0.1~dev30-4.12.3 · SUSE:OpenStack Cloud 7	Package registry (OSV)

Exploit status

Weaponized

A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.

Evidence

Metasploit module ×1
Exploit-DB entry ×2

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
Source	Kind	Date
Exploit-DB entry	dos	2018-03-08
Exploit-DB entry	dos	2018-03-05
Metasploit module	auxiliary/scanner/memcached/memcached_ampMemcached Stats Amplification Scannerauxiliary	2018-02-27

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

MetasploitFeb 27, 2018-6 d
First PoCMar 5, 2018same day
PublishedMar 5, 2018
TodayOct 29, 2026+3160 d

EPSS, last 120 days+1% in 7 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

memcached/memcachedcommit dbb7a8a

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
No account or password is required.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: none
Integrity: none
Availability: high · the service can be disrupted

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: None
Integrity impact: None
Availability impact: High

Weakness class (CWE)

CWE-400 · Uncontrolled Resource Consumption

CVSS vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Root cause

Code that parses nested structures sets no depth or size limit. A small input can turn into a disproportionate processing load.

The bug in code

The whole CWE-400 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1function expand(node) {
2  return node.children.map(expand);
3}

Fixed

1const MAX_DEPTH = 32;
2function expand(node, depth = 0) {
3  if (depth > MAX_DEPTH) throw new Error("too deep");
4  return node.children.map((c) => expand(c, depth + 1));
5}

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

ATT&CK techniques

Endpoint Denial of ServiceT1499

Change log

Fix✗ → ✓Sep 28, 2026, 10:46 PM UTC

For records you follow, these changes also arrive as notifications. →

References

www.synology.com/support/security/Synology_SA_18_07

Show all references (12 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records