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CVE-2021-35642

19
FAUCET Score

CVE-2021-35642 is a denial-of-service vulnerability affecting Oracle MySQL Server versions 8.0.26 and prior, specifically within the Optimizer component. This medium-severity vulnerability (CVSS 4.9) allows a highly privileged attacker with network access to cause a complete system crash or hang. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 8.0.0, <= 8.0.26CPE matchmatch criteria
cpe:2.3:a:oracle:mysql:*:*:*:*:*:*:*:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:a:netapp:oncommand_insight:-:*:*:*:*:*:*:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:a:netapp:snapcenter:-:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

4.9MEDIUM

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
1.2
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.93%
Probability of exploitation in next 30 days
EPSS Percentile
78.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0193 is in the 86th percentile among its peer group of 3,566 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (7)

microsoftpatch availablevia msrc
Product: 18974-16820Fixed in: 8.0.27-1
microsoftpatch availablevia msrc
Product: cm1 mysql 8.0.27-1 on CBL Mariner 1.0Fixed in: 8.0.27-1
microsoftpatch availablevia msrc
Product: 18806-16823Fixed in: 8.0.28-1
microsoftpatch availablevia msrc
Product: cbl2 mysql 8.0.28-1 on CBL Mariner 2.0Fixed in: 8.0.28-1
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: mysql:8.0-8060020220830124159.ad008a3a
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 7Fixed in: rh-mysql80-mysql-0:8.0.30-1.el7
View patch
oraclevendor investigatingvia nvd_reference
View patch

Vendor Advisories (2)

redhatCVE-2021-35642Moderate

mysql: Server: Optimizer unspecified vulnerability (CPU Oct 2021)

Oct 19, 2021
microsoft2021-Oct/CVE-2021-35642Moderate

Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer). Supported versions that are affected are 8.0.26 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).

Oct 12, 2021

References

security.netapp.com / advisory/ntap-20211022-0003
Third Party Advisory
oracle.com / security-alerts/cpuoct2021.html
Vendor Advisory