CVE-2021-1998 — mysql: Server: Optimizer unspecified vulnerability (CPU Jan 2021)

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LOW

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

Published Jan 20, 2021

3.8

LOW

CVSS 3.1

EPSS 1.59%

Description

Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer). Supported versions that are affected are 8.0.20 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 update, insert or delete access to some of MySQL Server accessible data and unauthorized ability to cause a partial denial of service (partial DOS) of MySQL Server. CVSS 3.1 Base Score 3.8 (Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:L).

Affected products

Vendor Oracle Corporation Product MySQL Server Default
n/a
- Version
  8.0.20 and prior
  Status
  affected
  Constraints
  -

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Oracle Corporation

MySQL Server

n/a

Version	Status	Constraints
8.0.20 and prior	affected	-

Red Hat Enterprise Linux 8

mysql:8.0-8020020200828111438.4cda2c84

Fixed · RHSA-2020:3732
Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions

mysql:8.0-8000020200828111808.f8e95b4e

Fixed · RHSA-2020:3755
Red Hat Enterprise Linux 8.1 Extended Update Support

mysql:8.0-8010020200828111645.c27ad7f8

Fixed · RHSA-2020:3757
Red Hat Software Collections for Red Hat Enterprise Linux 7

rh-mysql80-mysql-0:8.0.21-1.el7

Fixed · RHSA-2020:3518
Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS

rh-mysql80-mysql-0:8.0.21-1.el7

Fixed · RHSA-2020:3518
Red Hat Software Collections for Red Hat Enterprise Linux 7.7 EUS

rh-mysql80-mysql-0:8.0.21-1.el7

Fixed · RHSA-2020:3518
Red Hat Enterprise Linux 6

mysql

Not affected
Red Hat Enterprise Linux 7

mariadb

Not affected
Red Hat Enterprise Linux 8

mariadb:10.3/mariadb

Not affected
Red Hat OpenStack Platform 10 (Newton)

mariadb-galera

Not affected
Red Hat OpenStack Platform 13 (Queens)

mariadb

Not affected
Red Hat Software Collections

rh-mariadb103-mariadb

Not affected

Product	Package	State	Advisory
Red Hat Enterprise Linux 8	mysql:8.0-8020020200828111438.4cda2c84	Fixed	RHSA-2020:3732
Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions	mysql:8.0-8000020200828111808.f8e95b4e	Fixed	RHSA-2020:3755
Red Hat Enterprise Linux 8.1 Extended Update Support	mysql:8.0-8010020200828111645.c27ad7f8	Fixed	RHSA-2020:3757
Red Hat Software Collections for Red Hat Enterprise Linux 7	rh-mysql80-mysql-0:8.0.21-1.el7	Fixed	RHSA-2020:3518
Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS	rh-mysql80-mysql-0:8.0.21-1.el7	Fixed	RHSA-2020:3518
Red Hat Software Collections for Red Hat Enterprise Linux 7.7 EUS	rh-mysql80-mysql-0:8.0.21-1.el7	Fixed	RHSA-2020:3518
Red Hat Enterprise Linux 6	mysql	Not affected	n/a
Red Hat Enterprise Linux 7	mariadb	Not affected	n/a
Red Hat Enterprise Linux 8	mariadb:10.3/mariadb	Not affected	n/a
Red Hat OpenStack Platform 10 (Newton)	mariadb-galera	Not affected	n/a
Red Hat OpenStack Platform 13 (Queens)	mariadb	Not affected	n/a
Red Hat Software Collections	rh-mariadb103-mariadb	Not affected	n/a

Remediation

No remediation recorded yet.

Metrics

1.59% 0.01595

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.01595

Score over time

2021–2026

EPSS v1
EPSS v5
EPSS v2
EPSS v3
EPSS v4

Percentile over time

EPSS v1
EPSS v5
EPSS v2
EPSS v3
EPSS v4

Table of values (12 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	1.59% (0.01595)	74.82th	v5 (v2026.06.15)
Jun 15, 2026	1.64% (0.01639)	73.19th	v5 (v2026.06.15)
Mar 17, 2025	0.27% (0.00274)	48.76th	v4 (v2025.03.14)
Dec 12, 2024	0.17% (0.00173)	55.72th	v3 (v2023.03.01)
Nov 8, 2023	0.17% (0.00173)	54.34th	v3 (v2023.03.01)
Mar 7, 2023	0.15% (0.00155)	50.01th	v3 (v2023.03.01)
Mar 6, 2023	0.95% (0.00950)	32.28th	v2 (v2022.01.01)
Apr 1, 2022	0.95% (0.00950)	28.61th	v2 (v2022.01.01)
Mar 31, 2022	6.73% (0.06726)	79.39th	v2 (v2022.01.01)
Jan 6, 2022	6.60% (0.06599)	82.86th	v1
Jan 5, 2022	1.55% (0.01550)	73.94th	v5 (v2026.06.15)
Apr 14, 2021	1.29% (0.01294)	0.00th	v1

Weaknesses (0)

No CWE recorded.

References (10)

https://access.redhat.com/security/cve/CVE-2021-1998
Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1922378
Issue Tracking
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CS5THZSGI7O2CZO44NWYE57AG2T7NK3K/
vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T7EAHJPWOOF4D6PEFLXW5IQWRRSZ3HRC/
vendor-advisoryx_refsource_FEDORA
https://nvd.nist.gov/vuln/detail/CVE-2021-1998
https://security.gentoo.org/glsa/202105-27
vendor-advisoryx_refsource_GENTOOThird Party Advisory
https://security.netapp.com/advisory/ntap-20210219-0003/
x_refsource_CONFIRMThird Party Advisory
https://www.cve.org/CVERecord?id=CVE-2021-1998
https://www.oracle.com/security-alerts/cpujan2021.html
x_refsource_MISCVendor Advisory
https://www.oracle.com/security-alerts/cpujan2021.html#AppendixMSQL

Link	Providers	Tags
https://access.redhat.com/security/cve/CVE-2021-1998		Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1922378		Issue Tracking
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CS5THZSGI7O2CZO44NWYE57AG2T7NK3K/		vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T7EAHJPWOOF4D6PEFLXW5IQWRRSZ3HRC/		vendor-advisoryx_refsource_FEDORA
https://nvd.nist.gov/vuln/detail/CVE-2021-1998
https://security.gentoo.org/glsa/202105-27		vendor-advisoryx_refsource_GENTOOThird Party Advisory
https://security.netapp.com/advisory/ntap-20210219-0003/		x_refsource_CONFIRMThird Party Advisory
https://www.cve.org/CVERecord?id=CVE-2021-1998
https://www.oracle.com/security-alerts/cpujan2021.html		x_refsource_MISCVendor Advisory
https://www.oracle.com/security-alerts/cpujan2021.html#AppendixMSQL