CVE-2018-20103

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2022-05-13. NVD baseline CVSS 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 7%CVSS: 7.5Exploit: NoneExposed: 0

A fix is available — apply it.

An issue was discovered in dns.c in HAProxy through 1.8.14. In the case of a compressed pointer, a crafted packet can trigger infinite recursion by making the pointer point to itself, or create a long chain of valid pointers resulting in stack exhaustion.

CVSS v3
7.5
EG Score
7.5(medium)
EPSS
93.1%
KEV
Not listed

Published

December 12, 2018

Last Modified

November 21, 2024

References (14)

Vendor Advisories for CVE-2018-20103(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuvim-haproxy (1.6.3-1ubuntu0.2) @ xenial2026-05-28ubuntu
redhatrh-haproxy18-haproxy-0:1.8.17-1.el72019-06-11redhat
redhatopenshift-enterprise-cluster-capacity-0:3.11.82-1.git.380.cf11c51.el72019-02-20redhat

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.

Weakness Classification(1)

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

Additional Vendor Advisories

(2)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 11× in last 7d / 48× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

  1. 2026-07-22 22:15 UTCEG score recompute
  2. 2026-07-22 14:05 UTCEPSS rescore
  3. 2026-07-21 15:22 UTCEPSS rescore
  4. 2026-07-21 01:17 UTCOSV refresh
  5. 2026-07-20 17:04 UTCEPSS rescore
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  1. 2026-07-06 02:20 UTCEPSS rescore
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  5. 2026-07-03 20:56 UTCOSV refresh
  6. 2026-07-02 16:54 UTCEPSS rescore
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  38. 2026-06-15 08:43 UTCOSV refresh
  39. 2026-06-14 23:15 UTCEPSS rescore
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  44. 2026-06-11 13:57 UTCEPSS rescore
  45. 2026-06-10 22:16 UTCEPSS rescore
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  47. 2026-06-08 14:14 UTCEPSS rescore
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  49. 2026-06-07 15:22 UTCEPSS rescore
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  66. 2026-05-28 00:20 UTCEG score recompute
  67. 2026-05-28 00:20 UTCVendor advisory
  68. 2026-05-28 00:20 UTCGHSA enrichment
  69. 2026-05-27 13:38 UTCEPSS rescore
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  71. 2026-05-26 13:42 UTCEPSS rescore
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  73. 2026-05-26 13:41 UTCOSV refresh
  74. 2026-05-26 07:17 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2018-20103?
CVE-2018-20103 is a high vulnerability published on December 12, 2018. An issue was discovered in dns.c in HAProxy through 1.8.14. In the case of a compressed pointer, a crafted packet can trigger infinite recursion by making the pointer point to itself, or create a long chain of valid pointers resulting in stack exhaustion.
When was CVE-2018-20103 disclosed?
CVE-2018-20103 was first published in the National Vulnerability Database on December 12, 2018, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2018-20103 actively exploited?
CVE-2018-20103 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 93.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2018-20103?
CVE-2018-20103 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2018-20103?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-20103, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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