CVE-2020-10933

MEDIUMNVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

Score 5.3 from GitHub Security Advisory published 2022-05-24. NVD baseline CVSS 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
5.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 3%CVSS: 5.3Exploit: NoneExposed: 0

A fix is available — apply it.

An issue was discovered in Ruby 2.5.x through 2.5.7, 2.6.x through 2.6.5, and 2.7.0. If a victim calls BasicSocket#read_nonblock(requested_size, buffer, exception: false), the method resizes the buffer to fit the requested size, but no data is copied. Thus, the buffer string provides the previous value of the heap. This may expose possibly sensitive data from the interpreter.

CVSS v3
5.3
EG Score
5.3(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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
Severity53% × 45%
Exploitation3% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
83.5%
KEV
Not listed

Published

May 4, 2020

Last Modified

November 21, 2024

References (8)

Vendor Advisories for CVE-2020-10933(6)

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

Patch Availability(7)

Vendor / EcosystemFixed in / PatchReleasedSource
ubunturuby2.3-tcltk (2.3.1-2~ubuntu16.04.15) @ xenial2026-05-27ubuntu
redhatruby:2.6-8020020220201131207.4cda2c842022-02-21redhat
redhatruby:2.6-8010020220201152941.c27ad7f82022-02-21redhat
redhatruby:2.5-8040020200923213910.522a0ee42021-06-29redhat
redhatruby:2.6-8040020210430142949.522a0ee42021-06-29redhat
redhatrh-ruby26-ruby-0:2.6.7-119.el72021-06-03redhat
redhatrh-ruby25-ruby-0:2.5.9-9.el72021-05-26redhat

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(2)

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 14× in last 7d / 45× 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 101 total refreshes for this CVE.

  1. 2026-07-23 01:48 UTCEG score recompute
  2. 2026-07-22 22:32 UTCEG score recompute
  3. 2026-07-22 14:05 UTCEPSS rescore
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  71. 2026-05-27 03:58 UTCVendor advisory
  72. 2026-05-27 03:58 UTCGHSA enrichment
  73. 2026-05-26 13:42 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2020-10933?
CVE-2020-10933 is a medium vulnerability published on May 4, 2020. An issue was discovered in Ruby 2.5.x through 2.5.7, 2.6.x through 2.6.5, and 2.7.0. If a victim calls BasicSocket#readnonblock(requestedsize, buffer, exception: false), the method resizes the buffer to fit the requested size, but no data is copied. Thus, the buffer string provides the previous…
When was CVE-2020-10933 disclosed?
CVE-2020-10933 was first published in the National Vulnerability Database on May 4, 2020, 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-2020-10933 actively exploited?
CVE-2020-10933 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 83.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2020-10933?
CVE-2020-10933 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2020-10933?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-10933, 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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