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CVE-2020-13921 — oap-server

CRITICALFix: apache/skywalking#4970

CVE-2020-13921 is a critical-severity (CVSS 9.8) SQL Injection vulnerability in org.apache.skywalking:oap-server. EPSS puts its 30-day exploitation probability at 33.5% (98th percentile). A fix is available for org.apache.skywalking:oap-server — see the affected versions and patch details below.

SQL Injection in Apache SkyWalking

Also known asGHSA-grpf-gg7v-5g5hPYSEC-2020-342
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Oct 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
33.5%probability of exploitation in next 30 days
Moderate Risk0.00%
Lower risk than most CVEs98th percentile — riskier than 98% of all scored CVEsHighest risk
0.00%14.1%28.1%42.2%6.0%33.5%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2020-13921 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,738 CVEs with a current EPSS score, this one falls in the 10–50% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected
☕org.apache.skywalking:oap-server

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

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

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
☕Mavenorg.apache.skywalking:oap-serverall versions8.1.0org.apache.skywalking:oap-server:8.1.0

Affected Products

1 product · 5 configurations
Application
skywalkingapache
5 versions
6.5.06.6.07.0.08.0.08.0.1

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.apache.skywalking:oap-server, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update org.apache.skywalking:oap-server to 8.1.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-13921 is resolved across your whole dependency graph.

  3. Workarounds

    Until you can upgrade, make sure every query built from user input uses parameterised statements or a prepared-statement API rather than string concatenation, and reduce the database account's privileges so an injected query cannot read or alter data beyond what the feature needs.

Frequently Asked Questions

**Resolved** Only when using H2/MySQL/TiDB as Apache SkyWalking storage, there is a SQL injection vulnerability in the wildcard query cases.
O3 Security · Impact-Aware SCA

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CVE-2020-13921: oap-server SQL Injection — Fixed in 8.1.0