CVE-2021-25329 [High] | Security Vulnerability in Tomcat

The fix for CVE-2020-9484 was incomplete. When using Apache Tomcat 10.0.0-M1 to 10.0.0, 9.0.0.M1 to 9.0.41, 8.5.0 to 8.5.61 or 7.0.0. to 7.0.107 with a configuration edge case that was highly unlikely to be used, the Tomcat instance was still vulnerable to CVE-2020-9494. Note that both the previously published prerequisites for CVE-2020-9484 and the previously published mitigations for CVE-2020-9484 also apply to this issue.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-05-20	1.00%	0.80%	-0.20%
2	2026-03-28	0.80%	1.00%	+0.20%
3	2026-03-04	—	0.80%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-05-20

1.00%

0.80%

-0.20%

2026-03-28

0.80%

1.00%

+0.20%

2026-03-04

—

0.80%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
7.0	3.1	HIGH	`CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H` Click to expand Attack vector (AV:L) They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by. Attack complexity (AC:H) Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work. Privileges required (PR:L) A normal user session is enough; they don’t have to be admin. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	1.0	5.9	[email protected]
4.4	2.0	MEDIUM	`AV:L/AC:M/Au:N/C:P/I:P/A:P` Click to expand Access vector (AV:L) Requires local access to the target system. Access complexity (AC:M) Exploitation needs some favorable conditions, but not exceptional ones. Authentication (AU:N) No authentication is required. Confidentiality impact (C:P) Partial confidentiality impact. Integrity impact (I:P) Partial integrity impact. Availability impact (A:P) Partial availability impact.	3.4	6.4	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

7.0

3.1

HIGH

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

Attack vector (AV:L): They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:H): Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:L): A normal user session is enough; they don’t have to be admin.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H): Serious risk that confidential data gets exposed in a big way.
Integrity (I:H): They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

1.0

5.9

[email protected]

4.4

2.0

MEDIUM

AV:L/AC:M/Au:N/C:P/I:P/A:P Click to expand

Access vector (AV:L): Requires local access to the target system.
Access complexity (AC:M): Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N): No authentication is required.
Confidentiality impact (C:P): Partial confidentiality impact.
Integrity impact (I:P): Partial integrity impact.
Availability impact (A:P): Partial availability impact.

3.4

6.4

[email protected]

OS Trackers for CVE-2021-25329

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2021-25329 not yet assigned priority: Debian including 1 source packages (tomcat9), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5.	https://security-tracker.debian.org/tracker/CVE-2021-25329
`gentoo`	low	CVE-2021-25329: 1 GLSA(s) (202208-34), 1 atom(s) (www-servers/tomcat); latest impact low.	https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2021-25329
`redhat`	low	—	https://access.redhat.com/security/cve/CVE-2021-25329
`suse`	high	CVE-2021-25329 severity important: SUSE including 367 source package names (5.0.0-beta1.2.122:tomcat-9.0.36-3.24.1, 5.0.0-beta1.2.122:tomcat-el-3_0-api-9.0.36-3.24.1, …), 722 product×package rows across 66 product lines (Container containers/apache-tomcat, Container suse/manager/5.0/x86_64/server, … (66 product lines)): Fixed 491, Known Affected 231.	https://www.suse.com/security/cve/CVE-2021-25329/
`ubuntu`	low	CVE-2021-25329 low priority: Ubuntu including 4 source packages (tomcat6, tomcat7, tomcat8, tomcat9), 64 status rows across 16 suites (bionic, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 40, ignored 8, released 7, needed 4, not-affected 4, needs-triage 1.	https://ubuntu.com/security/CVE-2021-25329

Affected software / configurations for CVE-2021-25329

Vendor	Product	Version	Raw CPE
apache	tomcat	>= 7.0.0, <= 7.0.107	cpe:2.3:a:apache:tomcat::::::::
apache	tomcat	>= 8.5.0, <= 8.5.61	cpe:2.3:a:apache:tomcat::::::::
apache	tomcat	>= 9.0.0, <= 9.0.41	cpe:2.3:a:apache:tomcat::::::::
apache	tomcat	9.0.0	cpe:2.3:a:apache:tomcat:9.0.0:milestone1::::::
apache	tomcat	9.0.0	cpe:2.3:a:apache:tomcat:9.0.0:milestone10::::::
apache	tomcat	9.0.0	cpe:2.3:a:apache:tomcat:9.0.0:milestone11::::::
apache	tomcat	9.0.0	cpe:2.3:a:apache:tomcat:9.0.0:milestone12::::::
apache	tomcat	9.0.0	cpe:2.3:a:apache:tomcat:9.0.0:milestone13::::::
apache	tomcat	9.0.0	cpe:2.3:a:apache:tomcat:9.0.0:milestone14::::::
apache	tomcat	9.0.0	cpe:2.3:a:apache:tomcat:9.0.0:milestone15::::::
apache	tomcat	9.0.0	cpe:2.3:a:apache:tomcat:9.0.0:milestone16::::::
apache	tomcat	9.0.0	cpe:2.3:a:apache:tomcat:9.0.0:milestone17::::::
apache	tomcat	9.0.0	cpe:2.3:a:apache:tomcat:9.0.0:milestone18::::::
apache	tomcat	9.0.0	cpe:2.3:a:apache:tomcat:9.0.0:milestone19::::::
apache	tomcat	9.0.0	cpe:2.3:a:apache:tomcat:9.0.0:milestone2::::::
apache	tomcat	9.0.0	cpe:2.3:a:apache:tomcat:9.0.0:milestone20::::::
apache	tomcat	9.0.0	cpe:2.3:a:apache:tomcat:9.0.0:milestone21::::::
apache	tomcat	9.0.0	cpe:2.3:a:apache:tomcat:9.0.0:milestone22::::::
apache	tomcat	9.0.0	cpe:2.3:a:apache:tomcat:9.0.0:milestone23::::::
apache	tomcat	9.0.0	cpe:2.3:a:apache:tomcat:9.0.0:milestone24::::::
apache	tomcat	9.0.0	cpe:2.3:a:apache:tomcat:9.0.0:milestone25::::::
apache	tomcat	9.0.0	cpe:2.3:a:apache:tomcat:9.0.0:milestone26::::::
apache	tomcat	9.0.0	cpe:2.3:a:apache:tomcat:9.0.0:milestone27::::::
apache	tomcat	9.0.0	cpe:2.3:a:apache:tomcat:9.0.0:milestone3::::::
apache	tomcat	9.0.0	cpe:2.3:a:apache:tomcat:9.0.0:milestone4::::::
apache	tomcat	9.0.0	cpe:2.3:a:apache:tomcat:9.0.0:milestone5::::::
apache	tomcat	9.0.0	cpe:2.3:a:apache:tomcat:9.0.0:milestone6::::::
apache	tomcat	9.0.0	cpe:2.3:a:apache:tomcat:9.0.0:milestone7::::::
apache	tomcat	9.0.0	cpe:2.3:a:apache:tomcat:9.0.0:milestone8::::::
apache	tomcat	9.0.0	cpe:2.3:a:apache:tomcat:9.0.0:milestone9::::::
apache	tomcat	10.0.0	cpe:2.3:a:apache:tomcat:10.0.0:-::::::
apache	tomcat	10.0.0	cpe:2.3:a:apache:tomcat:10.0.0:milestone1::::::
apache	tomcat	10.0.0	cpe:2.3:a:apache:tomcat:10.0.0:milestone10::::::
apache	tomcat	10.0.0	cpe:2.3:a:apache:tomcat:10.0.0:milestone2::::::
apache	tomcat	10.0.0	cpe:2.3:a:apache:tomcat:10.0.0:milestone3::::::
apache	tomcat	10.0.0	cpe:2.3:a:apache:tomcat:10.0.0:milestone4::::::
apache	tomcat	10.0.0	cpe:2.3:a:apache:tomcat:10.0.0:milestone5::::::
apache	tomcat	10.0.0	cpe:2.3:a:apache:tomcat:10.0.0:milestone6::::::
apache	tomcat	10.0.0	cpe:2.3:a:apache:tomcat:10.0.0:milestone7::::::
apache	tomcat	10.0.0	cpe:2.3:a:apache:tomcat:10.0.0:milestone8::::::
apache	tomcat	10.0.0	cpe:2.3:a:apache:tomcat:10.0.0:milestone9::::::
debian	debian_linux	9.0	cpe:2.3:o:debian:debian_linux:9.0:::::::*
debian	debian_linux	10.0	cpe:2.3:o:debian:debian_linux:10.0:::::::*
oracle	agile_plm	9.3.3	cpe:2.3:a:oracle:agile_plm:9.3.3:::::::*
oracle	agile_plm	9.3.6	cpe:2.3:a:oracle:agile_plm:9.3.6:::::::*
oracle	communications_cloud_native_core_policy	1.14.0	cpe:2.3:a:oracle:communications_cloud_native_core_policy:1.14.0:::::::*
oracle	communications_cloud_native_core_security_edge_protection_proxy	1.6.0	cpe:2.3:a:oracle:communications_cloud_native_core_security_edge_protection_proxy:1.6.0:::::::*
oracle	communications_instant_messaging_server	10.0.1.5.0	cpe:2.3:a:oracle:communications_instant_messaging_server:10.0.1.5.0:::::::*
oracle	database	12.2.0.1	cpe:2.3:a:oracle:database:12.2.0.1::::enterprise:::
oracle	database	19c	cpe:2.3:a:oracle:database:19c::::enterprise:::
oracle	database	21c	cpe:2.3:a:oracle:database:21c::::enterprise:::
oracle	graph_server_and_client	< 21.3.0	cpe:2.3:a:oracle:graph_server_and_client::::::::
oracle	instantis_enterprisetrack	17.1	cpe:2.3:a:oracle:instantis_enterprisetrack:17.1:::::::*
oracle	instantis_enterprisetrack	17.2	cpe:2.3:a:oracle:instantis_enterprisetrack:17.2:::::::*
oracle	instantis_enterprisetrack	17.3	cpe:2.3:a:oracle:instantis_enterprisetrack:17.3:::::::*
oracle	managed_file_transfer	12.2.1.3.0	cpe:2.3:a:oracle:managed_file_transfer:12.2.1.3.0:::::::*
oracle	managed_file_transfer	12.2.1.4.0	cpe:2.3:a:oracle:managed_file_transfer:12.2.1.4.0:::::::*
oracle	mysql_enterprise_monitor	<= 8.0.23	cpe:2.3:a:oracle:mysql_enterprise_monitor::::::::
oracle	siebel_ui_framework	< 21.9	cpe:2.3:a:oracle:siebel_ui_framework::::::::
oracle	siebel_ui_framework	21.9	cpe:2.3:a:oracle:siebel_ui_framework:21.9:::::::*

References for CVE-2021-25329

URL	Tags
http://www.openwall.com/lists/oss-security/2021/03/01/2	Mailing List Third Party Advisory
https://lists.apache.org/thread.html/r11ce01e8a4c7269b88f88212f21830edf73558997ac7744f37769b77%40%3Cusers.tomcat.apache.org%3E
https://lists.apache.org/thread.html/r732b2ca289dc02df2de820e8775559abd6c207f159e39f559547a085%40%3Cusers.tomcat.apache.org%3E
https://lists.apache.org/thread.html/r8a2ac0e476dbfc1e6440b09dcc782d444ad635d6da26f0284725a5dc%40%3Cusers.tomcat.apache.org%3E
https://lists.apache.org/thread.html/rb51ccd58b2152fc75125b2406fc93e04ca9d34e737263faa6ff0f41f%40%3Cusers.tomcat.apache.org%3E
https://lists.apache.org/thread.html/rf6d5d57b114678d8898005faef31e9fd6d7c981fcc4ccfc3bc272fc9%40%3Cdev.tomcat.apache.org%3E
https://lists.apache.org/thread.html/rfe62fbf9d4c314f166fe8c668e50e5d9dd882a99447f26f0367474bf%40%3Cannounce.apache.org%3E
https://lists.apache.org/thread.html/rfe62fbf9d4c314f166fe8c668e50e5d9dd882a99447f26f0367474bf%40%3Cannounce.tomcat.apache.org%3E	Mailing List Vendor Advisory
https://lists.apache.org/thread.html/rfe62fbf9d4c314f166fe8c668e50e5d9dd882a99447f26f0367474bf%40%3Cdev.tomcat.apache.org%3E
https://lists.apache.org/thread.html/rfe62fbf9d4c314f166fe8c668e50e5d9dd882a99447f26f0367474bf%40%3Cusers.tomcat.apache.org%3E
https://lists.debian.org/debian-lts-announce/2021/03/msg00018.html	Mailing List Third Party Advisory
https://security.gentoo.org/glsa/202208-34	Third Party Advisory
https://security.netapp.com/advisory/ntap-20210409-0002/	Third Party Advisory
https://www.debian.org/security/2021/dsa-4891	Third Party Advisory
https://www.oracle.com//security-alerts/cpujul2021.html	Patch Third Party Advisory
https://www.oracle.com/security-alerts/cpujan2022.html	Patch Third Party Advisory
https://www.oracle.com/security-alerts/cpuoct2021.html	Patch Third Party Advisory

URL

CVE-2021-25329 | Incomplete fix for CVE-2020-9484

Exploit prediction scoring system (EPSS) score for CVE-2021-25329

Common vulnerability scoring system (CVSS) metrics for CVE-2021-25329

Weakness enumeration for CVE-2021-25329

GitHub Security Advisory for CVE-2021-25329

OS Trackers for CVE-2021-25329

Affected software / configurations for CVE-2021-25329

References for CVE-2021-25329