CVE-2020-36318

CRITICALNVD 9.89.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 1.7% (76th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3
Trending — 4 sources updated this week

Also known asEUVD-2020-23860 (ENISA EUVD) · GHSA-w7c8-v5h2-32ff (GitHub Security Advisories)Source: ENISA EUVD

9.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.7%CVSS: 9.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

In the standard library in Rust before 1.49.0, VecDeque::make_contiguous has a bug that pops the same element more than once under certain condition. This bug could result in a use-after-free or double free.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
45
EG Risk 45/100

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)
Severity98% × 45%
Impact severity (EG Severity): CVSS 9.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation1.7% × 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 or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (no CISA value, KEV listing or 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.
EPSS PROB
1.7%
EPSS %ILE
76th
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 (9.8): severity, escalated by confirmed exploitation. This CVE's 9.8 is its impact severity (EG Severity), not escalated.

EG Severity
9.8 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
EG Likelihood
1.7% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-01). 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 or medium mission impact; Track* at high (mission-essential systems).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, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (no CISA value, KEV listing or 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.

The score's inputs: 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

April 11, 2021

Last Modified

November 21, 2024

Advisory Details (2)

Auto-updated Oct 4, 2026
Patch available. Sources: github_pr.
GitHub pull request

fix soundness issue in `make_contiguous`

Fix merged in rust-lang/rust PR #79814 on 2020-12-10 — awaiting tagged release

https://github.com/rust-lang/rust/pull/79814
Web page

VecDeque: length 0 underflow and bogus values from pop_front(), triggered by a certain sequence of reserve(), push_back(), make_contiguous(), pop_front() · Issue #79808 · rust-lang/rust · GitHub

https://github.com/rust-lang/rust/issues/79808

Vendor Advisories for CVE-2020-36318(1)

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

Patch Availability(2)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatrust-toolset-1.49-rust-0:1.49.0-1.el7_92021-06-03redhat
redhatrust-toolset:rhel8-8040020210113215649.bd734dca2021-05-18redhat

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 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
rustc1.48.0+dfsg1-2 ... 1.96.0+dfsg1-1~exp1 (200 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
rustc—
  • every version up to 1.53.0+dfsg1-1: fixed in 1.53.0+dfsg1-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
rustc—
  • every version up to 1.53.0+dfsg1-1: fixed in 1.53.0+dfsg1-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
rustc—
  • every version up to 1.53.0+dfsg1-1: fixed in 1.53.0+dfsg1-1
—

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 27× in last 7d / 93× 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 99 of 247 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. 1 repeat row among the latest 100 is merged into the row it repeats. The 148 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-02 16:36 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  2. 2026-11-02 14:07 UTCEG score recompute
  3. 2026-11-02 14:07 UTCVendor advisory
  4. 2026-11-02 14:07 UTCGHSA enrichmentGHSA-w7c8-v5h2-32ff · GitHub severity CRITICAL
  5. 2026-11-01 14:08 UTCEG score recompute
  6. 2026-11-01 14:08 UTCVendor advisory
  7. 2026-11-01 14:08 UTCGHSA enrichmentGHSA-w7c8-v5h2-32ff · GitHub severity CRITICAL
  8. 2026-10-31 16:28 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  9. 2026-10-31 14:09 UTCEG score recompute
  10. 2026-10-31 14:09 UTCVendor advisory
  11. 2026-10-31 14:09 UTCGHSA enrichmentGHSA-w7c8-v5h2-32ff · GitHub severity CRITICAL
  12. 2026-10-30 16:29 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  13. 2026-10-30 14:10 UTCEG score recompute
  14. 2026-10-30 14:10 UTCVendor advisory
  15. 2026-10-30 14:10 UTCGHSA enrichmentGHSA-w7c8-v5h2-32ff · GitHub severity CRITICAL
  16. 2026-10-29 16:28 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  17. 2026-10-29 14:13 UTCEG score recompute
  18. 2026-10-29 14:13 UTCVendor advisory
  19. 2026-10-29 14:13 UTCGHSA enrichmentGHSA-w7c8-v5h2-32ff · GitHub severity CRITICAL
  20. 2026-10-28 16:28 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  21. 2026-10-28 14:15 UTCEG score recompute
  22. 2026-10-28 14:15 UTCVendor advisory
  23. 2026-10-28 14:14 UTCGHSA enrichmentGHSA-w7c8-v5h2-32ff · GitHub severity CRITICAL
  24. 2026-10-27 16:28 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  25. 2026-10-27 13:57 UTCEG score recompute
Show 74 more
  1. 2026-10-27 13:57 UTCVendor advisory
  2. 2026-10-27 13:56 UTCGHSA enrichmentGHSA-w7c8-v5h2-32ff · GitHub severity CRITICAL
  3. 2026-10-26 16:27 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  4. 2026-10-26 13:24 UTCVendor advisory
  5. 2026-10-26 13:24 UTCGHSA enrichmentGHSA-w7c8-v5h2-32ff · GitHub severity CRITICAL
  6. 2026-10-25 18:43 UTCEG score recompute
  7. 2026-10-25 16:28 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  8. 2026-10-25 13:14 UTCEG score recompute
  9. 2026-10-25 13:14 UTCVendor advisory
  10. 2026-10-25 13:14 UTCGHSA enrichmentGHSA-w7c8-v5h2-32ff · GitHub severity CRITICAL
  11. 2026-10-24 16:28 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  12. 2026-10-24 13:15 UTCEG score recompute
  13. 2026-10-24 13:15 UTCVendor advisory
  14. 2026-10-24 13:15 UTCGHSA enrichmentGHSA-w7c8-v5h2-32ff · GitHub severity CRITICAL
  15. 2026-10-23 16:28 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  16. 2026-10-23 13:16 UTCEG score recompute
  17. 2026-10-23 13:16 UTCVendor advisory
  18. 2026-10-23 13:16 UTCGHSA enrichmentGHSA-w7c8-v5h2-32ff · GitHub severity CRITICAL
  19. 2026-10-22 16:29 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  20. 2026-10-22 13:18 UTCEG score recompute
  21. 2026-10-22 13:18 UTCVendor advisory
  22. 2026-10-22 13:18 UTCGHSA enrichmentGHSA-w7c8-v5h2-32ff · GitHub severity CRITICAL
  23. 2026-10-21 16:28 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  24. 2026-10-21 13:19 UTCEG score recompute
  25. 2026-10-21 13:19 UTCVendor advisory
  26. 2026-10-21 13:19 UTCGHSA enrichmentGHSA-w7c8-v5h2-32ff · GitHub severity CRITICAL
  27. 2026-10-20 16:28 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  28. 2026-10-20 12:59 UTCEG score recompute
  29. 2026-10-20 12:59 UTCVendor advisory
  30. 2026-10-20 12:58 UTCGHSA enrichmentGHSA-w7c8-v5h2-32ff · GitHub severity CRITICAL
  31. 2026-10-19 16:27 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  32. 2026-10-19 12:52 UTCEG score recompute
  33. 2026-10-19 12:52 UTCVendor advisory
  34. 2026-10-19 12:52 UTCGHSA enrichmentGHSA-w7c8-v5h2-32ff · GitHub severity CRITICAL
  35. 2026-10-18 16:28 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  36. 2026-10-18 11:23 UTCVendor advisory
  37. 2026-10-18 11:23 UTCGHSA enrichmentGHSA-w7c8-v5h2-32ff · GitHub severity CRITICAL
  38. 2026-10-18 09:22 UTCEG score recompute
  39. 2026-10-17 16:28 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  40. 2026-10-17 09:25 UTCEG score recompute
  41. 2026-10-17 09:25 UTCVendor advisory
  42. 2026-10-17 09:25 UTCGHSA enrichmentGHSA-w7c8-v5h2-32ff · GitHub severity CRITICAL
  43. 2026-10-16 16:33 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  44. 2026-10-16 09:26 UTCEG score recompute
  45. 2026-10-16 09:26 UTCVendor advisory
  46. 2026-10-16 09:25 UTCGHSA enrichmentGHSA-w7c8-v5h2-32ff · GitHub severity CRITICAL
  47. 2026-10-15 16:27 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  48. 2026-10-15 08:59 UTCEG score recompute
  49. 2026-10-15 08:59 UTCVendor advisory
  50. 2026-10-15 08:59 UTCGHSA enrichmentGHSA-w7c8-v5h2-32ff · GitHub severity CRITICAL
  51. 2026-10-14 16:28 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  52. 2026-10-14 05:16 UTCEG score recompute
  53. 2026-10-14 05:16 UTCVendor advisory
  54. 2026-10-14 05:16 UTCGHSA enrichmentGHSA-w7c8-v5h2-32ff · GitHub severity CRITICAL
  55. 2026-10-13 16:28 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  56. 2026-10-13 00:32 UTCVendor advisory
  57. 2026-10-13 00:31 UTCGHSA enrichmentGHSA-w7c8-v5h2-32ff · GitHub severity CRITICAL
  58. 2026-10-12 19:36 UTCEG score recompute
  59. 2026-10-12 16:29 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  60. 2026-10-11 23:59 UTCEG score recompute
  61. 2026-10-11 13:43 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  62. 2026-10-10 19:56 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  63. 2026-10-09 20:04 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  64. 2026-10-08 16:38 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  65. 2026-10-07 23:44 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  66. 2026-10-06 15:13 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  67. 2026-10-05 17:39 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  68. 2026-10-04 23:18 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  69. 2026-10-03 14:22 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  70. 2026-09-30 15:19 UTCEG score recompute
  71. 2026-09-30 14:59 UTCEPSS rescoreEPSS 1.7% · 75th percentile
  72. 2026-09-29 15:14 UTCEPSS rescoreEPSS 1.7% · 75th percentile
  73. 2026-09-27 13:41 UTCEPSS rescoreEPSS 1.7% · 75th percentile
  74. 2026-09-26 15:54 UTCEPSS rescoreEPSS 1.7% · 75th percentile

Frequently asked(5)

What is CVE-2020-36318?
CVE-2020-36318 is a critical-severity vulnerability; its CVE record was published on April 11, 2021. In the standard library in Rust before 1.49.0, VecDeque::make_contiguous has a bug that pops the same element more than once under certain condition. This bug could result in a use-after-free or double free.
When was the CVE record for CVE-2020-36318 published?
The CVE record for CVE-2020-36318 was published on April 11, 2021. That is the record's publication date; the vulnerability itself may have been made public earlier. 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-2020-36318 actively exploited?
CVE-2020-36318 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.7% probability of exploitation in the next 30 days (76th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2020-36318?
CVE-2020-36318 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2020-36318?
A fix for CVE-2020-36318 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2020-36318 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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