`CVE-2021-2471` Oracle MySQL Connectors

Affected software	Oracle MySQL Connectors
Affected versions	8.0.26 and prior
Severity	5.9 Medium CVSS 3.1 2 scores
Fixed in	Oracle Critical Patch Update October 2021
Weakness	Incorrect authorization (CWE-863)
Published	20 Oct 2021
Updated	17 Jun 2026

Description

Vulnerability in the MySQL Connectors product of Oracle MySQL (component: Connector/J). Supported versions that are affected are 8.0.26 and prior. Difficult to exploit vulnerability allows high privileged attacker with network access via multiple protocols to compromise MySQL Connectors. Successful attacks of this vulnerability can result in unauthorized access to critical data or complete access to all MySQL Connectors accessible data and unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Connectors. CVSS 3.1 Base Score 5.9 (Confidentiality and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:H).

Exploitation status

Proof of concept only

A proof of concept exists, but no reviewed exploit catalogue lists this CVE.

CISA KEV not listed
VulnCheck KEV not listed
CISA Vulnrichment exploitation: none
Indexed PoC 3 indexed Published artifacts you can open, in GitHub PoC; first seen 2021-10-22.
EPSS 7.5% chance in 30 days

2 of these are GitHub repositories with fewer than 5 stars. They are listed for reference and don't count toward the exploitation status above.

Index	Artifact	Stars	First seen
GitHub PoC	h2-jdbc(https://github.com/h2database/h2database/issues/3195) & mysql-jdbc(CVE-2021-2471) SQLXML XXE vulnerability reproduction.	54	2021-10-22
GitHub PoC	PoC for CVE-2021-2471 - XXE in MySQL Connector/J	3	2021-10-22
GitHub PoC	cckuailong/CVE-2021-2471	3	2021-10-22

Waratek protection

Mitigation candidate

A kind of vulnerability Waratek's rules address, with exploit code published or exploitation reported. No rule exists and none is planned yet. The decision below says what we found to build a rule from.

Protection none
Action unverified
Review automated Inferred
Record active

Decided by	The affected package being open source on Maven, so the fix can be read
Finding	This CVE affects an open-source Java library published on Maven Central (Maven packages: mysql:mysql-connector-java), so it is squarely in ARMR's territory and the source needed to understand the defect is public. That makes it a candidate for an ARMR patch rule. No rule exists and none is scheduled: the diff between the affected and fixed versions has not been read, and a closer look may find no hook point ARMR can act on.

Decided by

The affected package being open source on Maven, so the fix can be read

Finding

This CVE affects an open-source Java library published on Maven Central (Maven packages: mysql:mysql-connector-java), so it is squarely in ARMR's territory and the source needed to understand the defect is public. That makes it a candidate for an ARMR patch rule. No rule exists and none is scheduled: the diff between the affected and fixed versions has not been read, and a closer look may find no hook point ARMR can act on.

CVSS

5.9 MEDIUM v3.1 CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:H 2 metrics

We show the highest score from the newest CVSS version. Scores from different versions can't be compared, and the first score listed is sometimes a 0.0 placeholder.

Version Score Band Vector Assigner Type

CVSS 3.1 5.9 MEDIUM CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:H secalert_us@oracle.com Secondary published

CVSS 2.0 7.9 none AV:N/AC:M/Au:S/C:C/I:N/A:C NVD Primary

Version	Score	Band	Vector	Assigner	Type
CVSS 3.1	5.9	MEDIUM	`CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:H`	secalert_us@oracle.com	Secondary	published
CVSS 2.0	7.9	none	`AV:N/AC:M/Au:S/C:C/I:N/A:C`	NVD	Primary

Affected software and releases

Oracle advisories

Advisory	Type	Quarter	Products Oracle names in its risk matrix
Oracle Critical Patch Update April 2022 ↗	CPU	2022-Q2	Oracle Communications / CNC Console (MySQL Connectors) (1.9.0) Oracle Communications / NSSF (MySQL) (1.8.0) Oracle Communications / Policy (MySQL) (1.15.0) Oracle Communications / SEPP (MySQL) (1.7.0)
Oracle Critical Patch Update October 2021 ↗	CPU	2021-Q4	Oracle MySQL / Connector/J (8.0.26 and prior)

Advisory

Type

Quarter

Products Oracle names in its risk matrix

Oracle Critical Patch Update April 2022 ↗

CPU

2022-Q2

Oracle Communications / CNC Console (MySQL Connectors) (1.9.0)
Oracle Communications / NSSF (MySQL) (1.8.0)
Oracle Communications / Policy (MySQL) (1.15.0)
Oracle Communications / SEPP (MySQL) (1.7.0)

Oracle Critical Patch Update October 2021 ↗

CPU

2021-Q4

Oracle MySQL / Connector/J (8.0.26 and prior)

Oracle components and versions

Family	Component	Versions, as Oracle lists them	Read as
Oracle Communications	CNC Console (MySQL Connectors)	1.9.0	1.9.0
Oracle Communications	NSSF (MySQL)	1.8.0	1.8.0
Oracle Communications	Policy (MySQL)	1.15.0	1.15.0
Oracle Communications	SEPP (MySQL)	1.7.0	1.7.0
Oracle MySQL	Connector/J	8.0.26 and prior

Maven packages

Affected and fixed versions, from OSV.dev

Package Introduced Fixed Last affected

mysql:mysql-connector-java 8.0.0 8.0.27 unbounded

Package	Introduced	Fixed	Last affected
`mysql:mysql-connector-java`	8.0.0	`8.0.27`	unbounded

Products and versions

7 products, 8 version entries

Source	Vendor	Product	Scheme	Affected versions
osv	mysql	mysql-connector-java	generic	≥ 8.0.0 and ＜ 8.0.27
nvd	oracle	communications cloud native core console	generic	1.9.0
nvd	oracle	communications cloud native core network slice selection function	generic	1.8.0
nvd	oracle	communications cloud native core policy	generic	1.15.0
nvd	oracle	communications cloud native core security edge protection proxy	generic	1.7.0
nvd	oracle	mysql connectors	generic	≥ 8.0.0 and ≤ 8.0.26
nvd	quarkus	quarkus	generic	＜ 2.2.4 · ≥ 2.3.0 and ＜ 2.6.0

Source

Vendor

Product

Scheme

Affected versions

osv

mysql

mysql-connector-java

generic

≥ 8.0.0 and ＜ 8.0.27

nvd

oracle

communications cloud native core console

generic

1.9.0

nvd

oracle

communications cloud native core network slice selection function

generic

1.8.0

nvd

oracle

communications cloud native core policy

generic

1.15.0

nvd

oracle

communications cloud native core security edge protection proxy

generic

1.7.0

nvd

oracle

mysql connectors

generic

≥ 8.0.0 and ≤ 8.0.26

nvd

quarkus

generic

＜ 2.2.4 · ≥ 2.3.0 and ＜ 2.6.0

References

URL	Tags
https://www.oracle.com/security-alerts/cpuapr2022.html	WEB
https://www.oracle.com/security-alerts/cpuoct2021.html	WEB

URL

Timeline

Published	2021-10-20	By the CVE Program.
NVD record modified	2026-06-17	NVD's own last-modified date for this record.

Published

2021-10-20

By the CVE Program.

NVD record modified

2026-06-17

NVD's own last-modified date for this record.

How VRT decided (17 of 24 rules ran)

17 of 24 rules ran. The rest didn't run because an earlier rule had already settled the CVE.

# Rule Outcome Status Detail

identity: Does this identifier describe a vulnerability at all? the first rule that matches decides

1 rejected no match CVE Program withdrawal of this identifier

scope: Is it a vulnerability Waratek protects? the first rule that matches decides

2 armr-patch-file no match An ARMR patch file on disk for this CVE

3 armr-secure-rule-file no match An ARMR security-rule template on disk for this CVE

4 manual-classification no match A researcher's recorded decision for this specific CVE

5 manual classification no match Manual classification of this CVE in the legacy dataset

6 non-java-upstream no match A root cause in non-Java code: an OS kernel, a C library, or a bundled runtime

7 oracle-component no match The defect being in a component of a tracked product the agent does not reach: JavaFX, the Java SE installer, the JInitiator browser plug-in, the native WebLogic proxy plug-in, or a native part of Oracle Application Server or Collaboration Suite (HTTP Server, Web Cache, Internet Directory, mail and calendar servers). Oracle gives these no CPE of their own and names them only in the description.

8 java-client-side no match Oracle's own risk-matrix note saying the CVE is reached only through untrusted code in the Java sandbox (applets, Web Start) or only through a client installation of Java, so a server running its own trusted code is not exposed

9 osv-maven matched In scope Maven packages: mysql:mysql-connector-java

10 cna-maven-package not reached An affected Maven artifact named by the CNA itself

11 known-cpe-product not reached An NVD CPE naming a product ARMR tracks

12 cna-cpe-product not reached A CPE the CNA published naming a tracked product. Oracle publishes these on advisory day, months before NVD.

13 oracle-advisory-family not reached A tracked product family named in Oracle's own risk matrix. CPE cannot carry a suite name, only a module.

14 cna-named-product not reached A tracked product named in words by the CVE's own CNA, on a record with no CPE yet. Apache and Eclipse publish these on advisory day, before NVD adds CPE data.

15 non-deployable-product not reached The only affected product being a sealed appliance image, where Java runs but no -javaagent can be attached

16 unmatched-product not reached No tracked product matched above, and none present at all

disposition: What do we do about one that is? every rule runs

17 patch-hint no match A reference pointing at the upstream fix: a commit, a PR, a Red Hat bug

18 open-source-maven decided it matched Mitigation candidate Open-source Maven artifact indexed by OSV (Maven packages: mysql:mysql-connector-java). The source is public, which makes an ARMR patch rule a candidate; nothing here establishes that one can be written.

19 poc-derivable skipped An indexed exploit clearing the evidence bar to reverse-engineer, where there is no source to read

20 no-exploit skipped Nothing to build a rule from yet: no published exploit, no CISA record of exploitation and no source-level change to read

21 secure-rule-match no match A vulnerability class already blocked by an ARMR security rule

22 exploited-no-fix-or-poc skipped Somebody exploiting this CVE (a CISA or VulnCheck KEV listing, or a CISA verdict of active exploitation), with no fix, source code or PoC to build a rule from

23 below-action-threshold withheld CVE ships in Oracle Critical Patch Update April 2022, Oracle Critical Patch Update October 2021 (CPU) — Oracle treats it as urgent, so severity does not settle it

24 no-exploit-published no match A CISA or VulnCheck KEV listing, a CISA verdict of active exploitation, a reviewed exploit catalogue, or a GitHub PoC with 5 or more stars carries this CVE — exploit code is in use or published, so it stays a candidate

Products the scope rules checked

The products this CVE's record names, and whether VRT tracks each one. The scope rules decided on these.

Vendor Product Tracked CPE Source

oracle communications_cloud_native_core_console tracked cpe:2.3:a:oracle:communications_cloud_native_core_console:1.9.0:*:*:*:*:*:*:* yaml

oracle communications_cloud_native_core_network_slice_selection_function tracked cpe:2.3:a:oracle:communications_cloud_native_core_network_slice_selection_function:1.8.0:*:*:*:*:*:*:* yaml

oracle communications_cloud_native_core_policy tracked cpe:2.3:a:oracle:communications_cloud_native_core_policy:1.15.0:*:*:*:*:*:*:* yaml

oracle communications_cloud_native_core_security_edge_protection_proxy tracked cpe:2.3:a:oracle:communications_cloud_native_core_security_edge_protection_proxy:1.7.0:*:*:*:*:*:*:* yaml

oracle mysql_connectors not tracked cpe:2.3:a:oracle:mysql_connectors:*:*:*:*:*:*:*:*

quarkus quarkus tracked cpe:2.3:a:quarkus:quarkus:*:*:*:*:*:*:*:* yaml

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