CVE-2013-4164

MEDIUMCVSS v2 · 6.86.8—
EchelonGraph scoreLOW confidence

This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 6.8 — v2 rates that MEDIUM (v2 bands: LOW 0.0–3.9 / MEDIUM 4.0–6.9 / HIGH 7.0–10.0; v2 has no CRITICAL band). Vector AV:N/AC:M/Au:N/C:P/I:P/A:P. CVSS v2 is an older, coarser metric than v3.1/v4.0 (no Scope, no User Interaction, no Attack Requirements), so it is not directly comparable to a v3 or v4 score. NVD has never re-scored this record under v3. EPSS predicts 35.0% exploitation probability in the next 30 days, which is reflected in EG Risk but does not lift the v2 base. Confidence: LOW.

Sources: epss, nvd_v2
Weaponized
6.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 35%CVSS v2: 6.8Exploit: Metasploit · epss top5pct · public exploitExposed: 0

A fix is available — apply it.

Heap-based buffer overflow in Ruby 1.8, 1.9 before 1.9.3-p484, 2.0 before 2.0.0-p353, 2.1 before 2.1.0 preview2, and trunk before revision 43780 allows context-dependent attackers to cause a denial of service (segmentation fault) and possibly execute arbitrary code via a string that is converted to a floating point value, as demonstrated using (1) the to_f method or (2) JSON.parse.

CVSS v2.0 (legacy)
6.8MEDIUMNVD never assigned a CVSS v3 rating to this CVE
EG Score
6.8(low)
EG Risk
61(Track)
EG Risk 61/100SSVC: 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
Severity68% × 45%
Exploitation65% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
35%
EPSS %ILE
98%
KEV
Not listed

Published

November 23, 2013

Last Modified

April 29, 2026

References (44)

Vendor Advisories for CVE-2013-4164(1)

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

Patch Availability(5)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibruby1.9.1 (1.9.3.194-8.1ubuntu2.1) @ saucy2026-05-28ubuntu
redhatruby193-rubygem-nokogiri-0:1.5.6-3.el6cf2014-03-11redhat
redhatruby193-ruby-0:1.9.3.448-40.1.el62014-01-07redhat
redhatruby-0:1.8.7.352-13.el6_42013-11-26redhat
redhatruby-0:1.8.7.352-13.el62013-11-25redhat

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

(4 across 2 ecosystems)
Debian:6.0(2)
PackageVulnerable rangeFixed inDependents
ruby1.81.8.7.302-2, 1.8.7.302-2squeeze11.8.7.302-2squeeze2—
ruby1.9.11.9.2.0-2, 1.9.2.0-2+armhf1.9.2.0-2+deb6u2—
Debian:7(2)
PackageVulnerable rangeFixed inDependents
ruby1.81.8.7.358-7, 1.8.7.358-7.11.8.7.358-7.1+deb7u1—
ruby1.9.11.9.3.194-8.1, 1.9.3.194-8.1+deb7u11.9.3.194-8.1+deb7u2—

Weakness Classification(1)

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

Additional Vendor Advisories

(5)

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 5× in last 7d / 16× 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 102 total refreshes for this CVE.

  1. 2026-08-21 23:44 UTCEPSS rescore
  2. 2026-08-20 22:50 UTCEPSS rescore
  3. 2026-08-19 16:59 UTCEPSS rescore
  4. 2026-08-18 13:42 UTCEPSS rescore
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  10. 2026-08-05 19:12 UTCEPSS rescore
  11. 2026-08-04 15:04 UTCEPSS rescore
  12. 2026-07-30 01:26 UTCEPSS rescore
  13. 2026-07-28 15:31 UTCEPSS rescore
  14. 2026-07-26 13:48 UTCEG score recompute▲ 6.80
  15. 2026-07-25 14:12 UTCEPSS rescore
  16. 2026-07-23 14:14 UTCEPSS rescore
  17. 2026-07-23 01:10 UTCEG score recompute▼ 0.80
  18. 2026-07-23 00:13 UTCEG score recompute▲ 0.80
  19. 2026-07-22 21:52 UTCEG score recompute
  20. 2026-07-22 14:04 UTCEPSS rescore
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  1. 2026-07-19 14:27 UTCEPSS rescore
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  5. 2026-07-16 16:58 UTCEPSS rescore
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  8. 2026-07-15 01:56 UTCEPSS rescore
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  24. 2026-06-21 01:57 UTCEPSS rescore
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  26. 2026-06-18 17:49 UTCEPSS rescore
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  28. 2026-06-17 17:49 UTCEPSS rescore
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  31. 2026-06-16 17:49 UTCEPSS rescore
  32. 2026-06-15 17:44 UTCEPSS rescore
  33. 2026-06-14 23:14 UTCEPSS rescore
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  35. 2026-06-12 23:08 UTCEPSS rescore
  36. 2026-06-11 13:56 UTCEPSS rescore
  37. 2026-06-10 13:18 UTCEPSS rescore
  38. 2026-06-08 14:14 UTCEPSS rescore
  39. 2026-06-07 15:22 UTCEPSS rescore
  40. 2026-06-06 13:45 UTCEPSS rescore
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  44. 2026-06-02 20:10 UTCEPSS rescore
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  46. 2026-06-01 13:49 UTCEPSS rescore
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  48. 2026-05-31 22:28 UTCEPSS rescore
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  50. 2026-05-31 00:14 UTCEPSS rescore
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  52. 2026-05-29 13:41 UTCEPSS rescore
  53. 2026-05-29 13:41 UTCEPSS rescore
  54. 2026-05-28 21:30 UTCEG score recompute
  55. 2026-05-28 21:30 UTCVendor advisory
  56. 2026-05-28 21:30 UTCGHSA enrichment
  57. 2026-05-28 13:42 UTCEPSS rescore
  58. 2026-05-28 13:42 UTCEPSS rescore
  59. 2026-05-28 13:42 UTCEPSS rescore
  60. 2026-05-27 13:38 UTCEPSS rescore
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  62. 2026-05-26 13:41 UTCEPSS rescore
  63. 2026-05-26 13:41 UTCEPSS rescore
  64. 2026-05-26 07:16 UTCEPSS rescore
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  66. 2026-05-24 16:43 UTCEPSS rescore
  67. 2026-05-22 21:15 UTCEPSS rescore
  68. 2026-05-22 21:15 UTCEPSS rescore
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  70. 2026-05-21 22:39 UTCEPSS rescore
  71. 2026-05-20 22:37 UTCEPSS rescore
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  73. 2026-05-20 11:21 UTCEPSS rescore
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  75. 2026-05-20 11:21 UTCEPSS rescore

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 Metasploit module). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Metasploitauxiliary/dos/http/rails_json_float_dos✓ verified
    First seen Nov 22, 2013

    Ruby on Rails JSON Processor Floating Point Heap Overflow DoS

    Open source ↗

Related CVEs(same vendor + same CWE)

Frequently asked(4)

What is CVE-2013-4164?
CVE-2013-4164 is a medium vulnerability published on November 23, 2013. Heap-based buffer overflow in Ruby 1.8, 1.9 before 1.9.3-p484, 2.0 before 2.0.0-p353, 2.1 before 2.1.0 preview2, and trunk before revision 43780 allows context-dependent attackers to cause a denial of service (segmentation fault) and possibly execute arbitrary code via a string that is converted to…
When was CVE-2013-4164 disclosed?
CVE-2013-4164 was first published in the National Vulnerability Database on November 23, 2013, with the most recent update on April 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2013-4164 actively exploited?
CVE-2013-4164 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 35% probability of exploitation in the next 30 days, which ranks it in the top 1.7% of all scored CVEs.
How do I remediate CVE-2013-4164?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2013-4164, 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.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2013-4164

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