CVE-2021-2021
No exploitation reported by the sources we read.
- Published2021-01-20
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer). Supported versions that are affected are 8.0.22 and prior. Easily exploitable vulnerability allows high privileged attacker with network access via multiple protocols to compromise MySQL Server. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server. CVSS 3.1 Base Score 4.9 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H).
Timeline
dates in UTC- 2021-01-2015:15CVE publishedNVD
- 2026-10-2319:23EPSS crossed 10 %FIRST EPSS
Observed activity
isMalicious corpus · updated 2026-10-23 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-2021?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-2021?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 32.x | = 32 | no fix published | NVD |
| 33.x | = 33 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 8.0 | ≥ 8.0.0, ≤ 8.0.22 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| — | all versions | no fix published | NVD |
2 more products in the sources.
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Distribution builds and vendor advisories
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Packages
- mecabAlmaLinux:8all versions · fixed in 0.996-1.module_el8.4.0+2532+b8928c02.9
- mecabAlmaLinux:8all versions · fixed in 0.996-1.module_el8.5.0+33+8bc5f36a.9
- mecab-ipadicAlmaLinux:8all versions · fixed in 2.7.0.20070801-16.module_el8.4.0+2532+b8928c02and 1 other package
- mecab-ipadicAlmaLinux:8all versions · fixed in 2.7.0.20070801-16.module_el8.5.0+33+8bc5f36aand 1 other package
- mysqlAlmaLinux:8all versions · fixed in 8.0.26-1.module_el8.4.0+2532+b8928c02and 6 other packages
- mysqlAlmaLinux:8all versions · fixed in 8.0.26-1.module_el8.5.0+33+8bc5f36aand 6 other packages
Fix
Advisories and patches
- www.oracle.comVendor Advisory
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
- Published
- 2021-01-20
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2021-2021?
Is CVE-2021-2021 actively exploited?
What is the CVSS score for CVE-2021-2021?
Running MySQL? Hear about its next vulnerability
Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.