CVE-2020-13921

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 33% (98th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 33%CVSS: 9.8Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

Resolved Only when using H2/MySQL/TiDB as Apache SkyWalking storage, there is a SQL injection vulnerability in the wildcard query cases.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
65
EG Risk 65/100CISA SSVC

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
Severity98% × 45%
Exploitation40% × 40%
Automatability30% × 15%
CISA SSVC: Track at low, Track* at medium and Attend at high mission impact.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
33%
EPSS %ILE
98th
KEV
Not listed

CISA SSVCTrack at low, Track* at medium and Attend at high mission impact.

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (EG-KEV: elevated) · Automatable unknown (not published for this CVE) · Technical impact total (CVSS ≥ 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 5, 2020

Last Modified

November 21, 2024

Advisory Details (3)

Auto-updated Oct 4, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: github_pr.
generic

Pony Mail

https://lists.apache.org/thread.html/r6f3a934ebc54585d8468151a494c1919dc1ee2cccaf237ec434dbbd6%40%3Cdev.skywalking.apache.org%3E
github_pr

fix fuzzy query sql injection

Fix merged in apache/skywalking PR #4970 on 2020-06-26 — awaiting tagged release

https://github.com/apache/skywalking/pull/4970
generic🔴 Active Exploitation

oss-security - [CVE-2020-13921] Apache SkyWalking SQL injection vulnerability after H2/MySQL/TiDB storage option activated.

http://www.openwall.com/lists/oss-security/2020/08/05/3

Affected Packages

(2 across 2 ecosystems)
Maven(1)
PackageVulnerable rangeFix by version rangeDependents
org.apache.skywalking:oap-server6.0.0-GA ... 8.0.1 (12 versions)
  • every version up to 8.1.0: fixed in 8.1.0
—
PyPI(1)
PackageVulnerable rangeFix by version rangeDependents
apache-skywalking0.1.0 ... 1.2.0 (12 versions)
  • every version on: no fix on record
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 3× in last 7d / 19× 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 142 total refreshes for this CVE.

  1. 2026-10-03 14:22 UTCEPSS rescore
  2. 2026-09-30 15:11 UTCEG score recompute
  3. 2026-09-30 14:59 UTCEPSS rescore
  4. 2026-09-26 20:03 UTCOSV refresh
  5. 2026-09-26 15:54 UTCEPSS rescore
  6. 2026-09-24 13:59 UTCEPSS rescore
  7. 2026-09-22 14:43 UTCEPSS rescore
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  18. 2026-09-07 05:18 UTCOSV refresh
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  1. 2026-08-30 01:18 UTCEPSS rescore
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  3. 2026-08-27 14:21 UTCEPSS rescore
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  5. 2026-08-25 13:45 UTCEPSS rescore
  6. 2026-08-20 22:51 UTCEPSS rescore
  7. 2026-08-20 15:01 UTCOSV refresh
  8. 2026-08-19 17:00 UTCEPSS rescore
  9. 2026-08-18 13:44 UTCEPSS rescore
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  18. 2026-08-05 19:14 UTCEPSS rescore
  19. 2026-08-05 09:40 UTCOSV refresh
  20. 2026-08-04 15:06 UTCEPSS rescore
  21. 2026-08-03 10:32 UTCEPSS rescore
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  23. 2026-07-30 16:24 UTCEPSS rescore
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  25. 2026-07-28 15:32 UTCEPSS rescore
  26. 2026-07-26 14:51 UTCEPSS rescore
  27. 2026-07-25 14:14 UTCEPSS rescore
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  29. 2026-07-23 14:15 UTCEPSS rescore
  30. 2026-07-23 14:15 UTCEPSS rescore
  31. 2026-07-23 01:49 UTCEG score recompute
  32. 2026-07-22 22:34 UTCEG score recompute
  33. 2026-07-22 14:05 UTCEPSS rescore
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  36. 2026-07-20 17:04 UTCEPSS rescore
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  39. 2026-07-19 08:22 UTCOSV refresh
  40. 2026-07-19 02:26 UTCEPSS rescore
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  42. 2026-07-18 10:02 UTCEPSS rescore
  43. 2026-07-16 16:59 UTCEPSS rescore
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  50. 2026-07-09 19:06 UTCEPSS rescore
  51. 2026-07-08 15:11 UTCEPSS rescore
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  54. 2026-07-05 02:27 UTCEPSS rescore
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  58. 2026-07-01 14:16 UTCOSV refresh
  59. 2026-06-30 23:20 UTCEPSS rescore
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  65. 2026-06-27 03:06 UTCEPSS rescore
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  72. 2026-06-21 01:57 UTCEPSS rescore
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  74. 2026-06-18 17:50 UTCEPSS rescore
  75. 2026-06-18 17:50 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2020-13921?
CVE-2020-13921 is a critical vulnerability published on August 5, 2020. Resolved Only when using H2/MySQL/TiDB as Apache SkyWalking storage, there is a SQL injection vulnerability in the wildcard query cases.
When was CVE-2020-13921 disclosed?
CVE-2020-13921 was first published on August 5, 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-2020-13921 actively exploited?
CVE-2020-13921 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 33% probability of exploitation in the next 30 days (98th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2020-13921?
CVE-2020-13921 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2020-13921?
A fix for CVE-2020-13921 is available: update to the fixed version the vendor names in its advisory.

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