CVE-2020-13921
CVE-2020-13921 is a critical-severity vulnerability in Apache Skywalking with a CVSS 3.x base score of 9.8. Its EPSS exploit-prediction score of 33% places it in the 98th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-89.
Key facts
- Severity: Critical (CVSS 3.x base score 9.8)
- CVSS v2: 7.5
- EPSS exploit prediction: 33% (98th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-89
- Affected product: Apache Skywalking
- Published:
- Last modified:
Description
**Resolved** Only when using H2/MySQL/TiDB as Apache SkyWalking storage, there is a SQL injection vulnerability in the wildcard query cases.
Frequently asked questions
- What is CVE-2020-13921?
- **Resolved** Only when using H2/MySQL/TiDB as Apache SkyWalking storage, there is a SQL injection vulnerability in the wildcard query cases.
- How severe is CVE-2020-13921?
- CVE-2020-13921 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2020-13921 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 33% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2020-13921?
- CVE-2020-13921 primarily affects Apache Skywalking. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2020-13921?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- When was CVE-2020-13921 published?
- CVE-2020-13921 was published on 2020-08-05 and last updated on 2026-06-17.
References
- http://www.openwall.com/lists/oss-security/2020/08/05/3
- https://github.com/apache/skywalking/pull/4970
- https://lists.apache.org/thread.html/r6f3a934ebc54585d8468151a494c1919dc1ee2cccaf237ec434dbbd6%40%3Cdev.skywalking.apache.org%3E
Affected products (5)
- cpe:2.3:a:apache:skywalking:6.5.0:*:*:*:*:*:*:*
- cpe:2.3:a:apache:skywalking:6.6.0:*:*:*:*:*:*:*
- cpe:2.3:a:apache:skywalking:7.0.0:*:*:*:*:*:*:*
- cpe:2.3:a:apache:skywalking:8.0.0:*:*:*:*:*:*:*
- cpe:2.3:a:apache:skywalking:8.0.1:*:*:*:*:*:*:*
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