CVE-2018-1000115

CRITICALNVD 7.59.0
EchelonGraph scoreHIGH confidence

“▲” beside the score: it is higher than NVD's CVSS score.

Score elevated to 9.0 because EPSS predicted 88% probability of exploitation within the next 30 days (99th percentile of EPSS-scored CVEs) when EchelonGraph scored this CVE. NVD baseline CVSS 7.5 retained for reference. Confidence: see factors.

Triggered by: EPSS exploit prediction (continuous uplift above 30%)
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Trending — 4 sources updated this weekWeaponized
9.0EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High exploitation likelihood — EPSS 88%
  • Public exploit code is available (Metasploit, other public proof-of-concept code)
CISA-KEV: Not listedEPSS PROB: 88%CVSS: 7.5Exploit: Metasploit · other public PoCExposed services: Not assessed

A fix is available — apply it.

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.

CVSS v3
7.5
EG Score
9.0CRITICALhigh confidence
EG Risk
69
EG Risk 69/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity75% × 45%
Impact severity (EG Severity): CVSS 7.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation88% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's BOD 26-04 default: no one has published Automatable for this CVE, and CISA treats it as “no” for a CVE not in KEV.
SSVC (CISA's decision table, applied by EchelonGraph): Track at low, Track* at medium and Attend at high mission impact.
Exploitation public PoC (exploit code on record) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
88%
EPSS %ILE
99th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (9.0): severity, escalated by confirmed exploitation. This CVE's 9.0 is EPSS's lift toward 9.0 from its impact severity (EG Severity, CVSS 7.5 HIGH): a likelihood of exploitation, not impact.

EG Severity
7.5 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
88% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-22). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track* at medium mission impactTrack at low, Track* at medium and Attend at high mission impact.CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low, Track* at medium and Attend at high mission impact.

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (exploit code on record) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). Where an input reads “CISA's BOD 26-04 default”, no one has published it for this CVE, and CISA's implementation guidance says: “If “Automatable” and “Technical Impact” information items about a CVE ID are not available and the CVE ID is not in the KEV Catalog, CISA will treat its values as “no” and “total,” respectively, until CISA or a third party provides metadata about the CVE ID. CISA will always provide the Vulnrichment data for a CVE ID listed in the KEV Catalog.” Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

March 5, 2018

Last Modified

November 21, 2024

Advisory Details (9)

Auto-updated Oct 14, 2026
Patch available. Sources: redhat, github_commit.
Web page

dormando on X: "For what it's worth, if you're getting attacked by memcached's, it's pretty easy to disable them since the source won't be spoofed. They may accept "shutdown\r\n", but also running "flush_all\r\n" in a loop will prevent amplification." / X

https://twitter.com/dormando/status/968579781729009664
Web page

ReleaseNotes156 · memcached/memcached Wiki · GitHub

https://github.com/memcached/memcached/wiki/ReleaseNotes156
Web page

UDP Amplification Attacks, result of Memcached UDP port 11211 · Issue #348 · memcached/memcached · GitHub

https://github.com/memcached/memcached/issues/348
GitHub commit

commit dbb7a8af9005 (memcached/memcached)

Fix landed in memcached/memcached commit dbb7a8af9005 — awaiting tagged release

https://github.com/memcached/memcached/commit/dbb7a8af90054bf4ef51f5814ef7ceb17d83d974
Red HatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2018:2857
Red HatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2018:2331
Red HatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2018:1627
Red HatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2018:1593
Red HatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 7.4.

https://access.redhat.com/errata/RHBA-2018:2140

Patch Availability(6)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntumemcached (1.4.25-2ubuntu1.3) @ xenial2026-10-22ubuntu
redhatopenstack-tripleo-heat-templates-0:0.8.14-42.el7ost2018-10-02redhat
redhatpython-tripleoclient-0:7.3.10-3.el7ost2018-08-20redhat
redhatopenstack-tripleo-heat-templates-0:2.0.0-65.el7ost2018-07-05redhat
redhatpuppet-tripleo-0:6.5.10-3.el7ost2018-05-18redhat
redhatpuppet-tripleo-0:5.6.8-6.el7ost2018-05-17redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(9 across 9 ecosystems)
Alpine:v3.4(1)
PackageVulnerable rangeFix by version rangeDependents
memcached1.4.10-r0 ... 1.4.7-r0 (27 versions)
  • every version up to 1.4.33-r2: fixed in 1.4.33-r2
—
Alpine:v3.5(1)
PackageVulnerable rangeFix by version rangeDependents
memcached1.4.10-r0 ... 1.4.7-r0 (29 versions)
  • every version up to 1.4.33-r2: fixed in 1.4.33-r2
—
Alpine:v3.6(1)
PackageVulnerable rangeFix by version rangeDependents
memcached1.4.10-r0 ... 1.4.7-r0 (33 versions)
  • every version up to 1.4.36-r2: fixed in 1.4.36-r2
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
memcached—
  • every version up to 1.5.6-1: fixed in 1.5.6-1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
memcached—
  • every version up to 1.5.6-1: fixed in 1.5.6-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
memcached—
  • every version up to 1.5.6-1: fixed in 1.5.6-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
memcached—
  • every version up to 1.5.6-1: fixed in 1.5.6-1
—
Debian:8(1)
PackageVulnerable rangeFix by version rangeDependents
memcached1.4.21-1.1, 1.4.21-1.1+deb8u1
  • every version up to 1.4.21-1.1+deb8u2: fixed in 1.4.21-1.1+deb8u2
—
Debian:9(1)
PackageVulnerable rangeFix by version rangeDependents
memcached1.4.33-1
  • every version up to 1.4.33-1+deb9u1: fixed in 1.4.33-1+deb9u1
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(6)

Data Freshness Timeline

(refreshed 19× in last 7d / 41× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 86 of 90 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 14 repeat rows among the latest 100 are merged into the row they repeat. The 4 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-22 21:37 UTCEG score recompute
  2. 2026-10-22 21:37 UTCVendor advisory
  3. 2026-10-22 21:36 UTCGHSA enrichmentGHSA-f4xm-w85j-gc55 · GitHub severity HIGH · GitHub CVSS 7.5
  4. 2026-10-21 20:12 UTCEG score recompute
  5. 2026-10-21 20:12 UTCVendor advisory
  6. 2026-10-21 20:12 UTCGHSA enrichmentGHSA-f4xm-w85j-gc55 · GitHub severity HIGH · GitHub CVSS 7.5
  7. 2026-10-20 18:50 UTCEG score recompute
  8. 2026-10-20 18:50 UTCVendor advisory
  9. 2026-10-20 18:50 UTCGHSA enrichmentGHSA-f4xm-w85j-gc55 · GitHub severity HIGH · GitHub CVSS 7.5
  10. 2026-10-20 16:27 UTCEPSS rescoreEPSS 88% · 99th percentile
  11. 2026-10-19 17:26 UTCEG score recompute
  12. 2026-10-19 17:26 UTCVendor advisory
  13. 2026-10-19 17:25 UTCGHSA enrichmentGHSA-f4xm-w85j-gc55 · GitHub severity HIGH · GitHub CVSS 7.5
  14. 2026-10-18 16:02 UTCVendor advisory
  15. 2026-10-18 16:02 UTCGHSA enrichmentGHSA-f4xm-w85j-gc55 · GitHub severity HIGH · GitHub CVSS 7.5
  16. 2026-10-18 10:24 UTCEG score recompute
  17. 2026-10-17 14:38 UTCEG score recompute
  18. 2026-10-17 14:38 UTCVendor advisory
  19. 2026-10-17 14:38 UTCGHSA enrichmentGHSA-f4xm-w85j-gc55 · GitHub severity HIGH · GitHub CVSS 7.5
  20. 2026-10-16 13:15 UTCEG score recompute
  21. 2026-10-16 13:15 UTCVendor advisory
  22. 2026-10-16 13:14 UTCGHSA enrichmentGHSA-f4xm-w85j-gc55 · GitHub severity HIGH · GitHub CVSS 7.5
  23. 2026-10-15 16:27 UTCEPSS rescoreEPSS 88% · 99th percentile
  24. 2026-10-15 11:51 UTCEG score recompute
  25. 2026-10-15 11:51 UTCVendor advisory
Show 61 more
  1. 2026-10-15 11:50 UTCGHSA enrichmentGHSA-f4xm-w85j-gc55 · GitHub severity HIGH · GitHub CVSS 7.5
  2. 2026-10-14 16:27 UTCEPSS rescoreEPSS 88% · 99th percentile
  3. 2026-10-14 07:20 UTCEG score recompute
  4. 2026-10-14 07:20 UTCVendor advisory
  5. 2026-10-14 07:20 UTCGHSA enrichmentGHSA-f4xm-w85j-gc55 · GitHub severity HIGH · GitHub CVSS 7.5
  6. 2026-10-13 02:36 UTCVendor advisory
  7. 2026-10-13 02:35 UTCGHSA enrichmentGHSA-f4xm-w85j-gc55 · GitHub severity HIGH · GitHub CVSS 7.5
  8. 2026-10-12 20:22 UTCEG score recompute
  9. 2026-10-12 00:45 UTCEG score recompute
  10. 2026-10-10 19:55 UTCEPSS rescoreEPSS 88% · 99th percentile
  11. 2026-10-06 15:12 UTCEPSS rescoreEPSS 88% · 99th percentile
  12. 2026-09-30 21:10 UTCOSV refresh
  13. 2026-09-30 14:59 UTCEPSS rescoreEPSS 88% · 99th percentile
  14. 2026-09-30 09:50 UTCEG score recompute
  15. 2026-09-26 15:53 UTCEPSS rescoreEPSS 88% · 99th percentile
  16. 2026-09-24 13:59 UTCEPSS rescoreEPSS 88% · 99th percentile
  17. 2026-09-23 13:42 UTCEPSS rescoreEPSS 88% · 99th percentile
  18. 2026-09-21 20:27 UTCEPSS rescoreEPSS 87% · 99th percentile
  19. 2026-09-12 02:53 UTCOSV refresh
  20. 2026-09-05 15:24 UTCEPSS rescoreEPSS 87% · 99th percentile
  21. 2026-08-30 19:13 UTCEPSS rescoreEPSS 88% · 99th percentile
  22. 2026-08-28 21:36 UTCEPSS rescoreEPSS 87% · 99th percentile
  23. 2026-08-27 14:21 UTCEPSS rescoreEPSS 88% · 99th percentile
  24. 2026-08-26 14:41 UTCEPSS rescoreEPSS 88% · 99th percentile
  25. 2026-08-24 08:27 UTCOSV refresh
  26. 2026-08-21 23:44 UTCEPSS rescoreEPSS 88% · 99th percentile
  27. 2026-08-16 02:10 UTCEPSS rescoreEPSS 88% · 99th percentile
  28. 2026-08-15 01:26 UTCEPSS rescoreEPSS 88% · 99th percentile
  29. 2026-08-12 13:46 UTCEPSS rescoreEPSS 88% · 99th percentile
  30. 2026-08-08 16:32 UTCEPSS rescoreEPSS 88% · 99th percentile
  31. 2026-08-08 04:49 UTCOSV refresh
  32. 2026-08-06 13:42 UTCEPSS rescoreEPSS 88% · 99th percentile
  33. 2026-07-28 15:32 UTCEPSS rescoreEPSS 88% · 99th percentile
  34. 2026-07-23 14:15 UTCEPSS rescoreEPSS 88% · 99th percentile
  35. 2026-07-23 01:31 UTCEG score recompute
  36. 2026-07-22 21:30 UTCEG score recompute▲ 1.50
  37. 2026-07-22 21:30 UTCVendor advisory
  38. 2026-07-22 21:30 UTCGHSA enrichmentGHSA-f4xm-w85j-gc55 · GitHub severity HIGH · GitHub CVSS 7.5
  39. 2026-07-21 16:18 UTCOSV refresh
  40. 2026-07-21 15:21 UTCEPSS rescoreEPSS 88% · 99th percentile
  41. 2026-07-15 16:54 UTCEPSS rescoreEPSS 88% · 99th percentile
  42. 2026-07-06 16:24 UTCEPSS rescoreEPSS 89% · 99th percentile
  43. 2026-07-04 12:26 UTCOSV refresh
  44. 2026-07-01 15:03 UTCEPSS rescoreEPSS 89% · 99th percentile
  45. 2026-06-27 03:06 UTCEPSS rescoreEPSS 89% · 99th percentile
  46. 2026-06-24 14:02 UTCEPSS rescoreEPSS 89% · 99th percentile
  47. 2026-06-23 21:30 UTCEPSS rescoreEPSS 89% · 99th percentile
  48. 2026-06-22 14:23 UTCEPSS rescoreEPSS 89% · 99th percentile
  49. 2026-06-16 00:09 UTCOSV refresh
  50. 2026-06-15 17:45 UTCEPSS rescoreEPSS 89% · 99th percentile
  51. 2026-06-13 22:57 UTCEPSS rescoreEPSS 87% · 99th percentile
  52. 2026-06-12 23:09 UTCEPSS rescoreEPSS 87% · 99th percentile
  53. 2026-06-10 22:15 UTCEPSS rescoreEPSS 87% · 99th percentile
  54. 2026-06-10 13:19 UTCEPSS rescoreEPSS 87% · 99th percentile
  55. 2026-06-08 14:14 UTCEPSS rescoreEPSS 87% · 99th percentile
  56. 2026-06-05 22:44 UTCEPSS rescoreEPSS 87% · 99th percentile
  57. 2026-06-05 06:08 UTCEPSS rescoreEPSS 87% · 99th percentile
  58. 2026-06-04 13:10 UTCEPSS rescoreEPSS 87% · 99th percentile
  59. 2026-06-01 13:49 UTCEPSS rescoreEPSS 84% · 99th percentile
  60. 2026-05-29 13:41 UTCEPSS rescoreEPSS 84% · 99th percentile
  61. 2026-05-28 13:42 UTCEPSS rescoreEPSS 84% · 99th percentile

Publicly available exploits

(3 references)

Public exploit code is referenced for this CVE (1 Metasploit module, 2 Exploit-DB entries). Defenders should treat patch urgency accordingly.

  • Metasploitauxiliary/scanner/memcached/memcached_amp✓ verified
    Published Mar 5, 2018

    Memcached Stats Amplification Scanner

    Open source ↗
  • Exploit-DBEDB-44265
    Published Mar 8, 2018

    Memcached 1.5.5 - 'Memcrashed ' Insufficient Control of Network Message Volume Denial of Service With Shodan API

    Open source ↗
  • Exploit-DBEDB-44264
    Published Mar 5, 2018

    Memcached 1.5.5 - 'Memcrashed' Insufficient Control Network Message Volume Denial of Service (1)

    Open source ↗

Frequently asked(5)

What is CVE-2018-1000115?
CVE-2018-1000115 is a critical-severity vulnerability; its CVE record was published on March 5, 2018. 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…
When was CVE-2018-1000115 made public?
CVE-2018-1000115 was made public on March 2, 2018: that is the date its CVE record's CNA, MITRE Corporation, gives for when the vulnerability was made public. The CVE record itself was published on March 5, 2018. EchelonGraph's copy of the record carries a last-modified date of November 21, 2024; the record at its source may have been updated since.
Is CVE-2018-1000115 actively exploited?
CVE-2018-1000115 is not currently on CISA's Known Exploited Vulnerabilities catalog. EchelonGraph's EG-KEV model places it in Tier 2 (Weaponized), which is not evidence of exploitation: a Metasploit module exists for it. EchelonGraph does not test whether exploit code works. FIRST EPSS estimates a 88% probability of exploitation in the next 30 days (99th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2018-1000115?
CVE-2018-1000115 has a CVSS v3 base score of 7.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0 (CRITICAL).
How do I remediate CVE-2018-1000115?
A fix for CVE-2018-1000115 is available: update to the fixed version the vendor names in its advisory.

Dependency Blast Radius

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