CVE-2018-8970

HIGHNVD 7.47.4—
EchelonGraph scoreMEDIUM confidence

Score 7.4 from GitHub Security Advisory (severity: HIGH) published 2022-05-14. NVD baseline CVSS 7.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.4EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.4Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

The int_x509_param_set_hosts function in lib/libcrypto/x509/x509_vpm.c in LibreSSL 2.7.0 before 2.7.1 does not support a certain special case of a zero name length, which causes silent omission of hostname verification, and consequently allows man-in-the-middle attackers to spoof servers and obtain sensitive information via a crafted certificate. NOTE: the LibreSSL documentation indicates that this special case is supported, but the BoringSSL documentation does not.

CVSS v3
7.4
EG Score
7.4(medium)
EG Risk
38(Track)
EG Risk 38/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity74% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
61%
KEV
Not listed

Published

March 24, 2018

Last Modified

November 21, 2024

References (6)

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 4× in last 7d / 24× 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.

Showing the most recent 100 of 141 total refreshes for this CVE.

  1. 2026-09-06 13:44 UTCEPSS rescore
  2. 2026-09-04 13:56 UTCEPSS rescore
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  1. 2026-08-07 16:23 UTCEPSS rescore
  2. 2026-08-07 00:33 UTCOSV refresh
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  20. 2026-07-23 01:37 UTCEG score recompute
  21. 2026-07-22 22:18 UTCEG score recompute
  22. 2026-07-22 14:05 UTCEPSS rescore
  23. 2026-07-21 15:48 UTCOSV refresh
  24. 2026-07-21 15:22 UTCEPSS rescore
  25. 2026-07-20 17:04 UTCEPSS rescore
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  27. 2026-07-19 14:28 UTCEPSS rescore
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  41. 2026-07-07 13:42 UTCEPSS rescore
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  45. 2026-07-06 02:20 UTCEPSS rescore
  46. 2026-07-05 02:27 UTCEPSS rescore
  47. 2026-07-04 11:26 UTCOSV refresh
  48. 2026-07-04 06:28 UTCEPSS rescore
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  50. 2026-07-01 15:03 UTCEPSS rescore
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  52. 2026-06-30 23:20 UTCEPSS rescore
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  74. 2026-06-18 17:50 UTCEPSS rescore
  75. 2026-06-18 17:50 UTCEPSS rescore

Frequently asked(5)

What is CVE-2018-8970?
CVE-2018-8970 is a high vulnerability published on March 24, 2018. The intx509paramsethosts function in lib/libcrypto/x509/x509_vpm.c in LibreSSL 2.7.0 before 2.7.1 does not support a certain special case of a zero name length, which causes silent omission of hostname verification, and consequently allows man-in-the-middle attackers to spoof servers and obtain…
When was CVE-2018-8970 disclosed?
CVE-2018-8970 was first published in the National Vulnerability Database on March 24, 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-2018-8970 actively exploited?
CVE-2018-8970 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 38.9% of all scored CVEs.
What is the CVSS score of CVE-2018-8970?
CVE-2018-8970 has a CVSS v3 base score of 7.4 (NVD).
How do I remediate CVE-2018-8970?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-8970, 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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