01 Record

CVE-2021-4104

Deserialization of untrusted data in JMSAppender in Apache Log4j 1.2

HighPUBLISHEDCNA: apache

CNA base score7.5 CVSS v3.xCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

View raw JSON

02 Description

Deserialization of untrusted data in JMSAppender in Apache Log4j 1.2

03 Exploitation and scoring

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

80.59% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 99.6% of scored records. A rank, not a probability.

NVD base score

7.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2021-12-14 00:00Z4 YR AGO

Last updated

2026-05-28 19:53Z5 MO AGO

Reserved

2021-12-13

Assigning CNA

apache

Record state

PUBLISHED

Severity

High (CVSS 7.5)

CNA CVSS vector

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

Weaknesses

CWE-502Deserialization of Untrusted DataBase
CWE-20Improper Input ValidationClass

Data version

5.2

Document digest

30ccdbc599712a8328d581be61e5f8d2d940f3d040c6e4bbc35c9325958b17e5

05 Affected products

VendorProductVersionsPlatforms

Apache Software FoundationApache Log4j 1.xApache Log4j 1.2 1.2.x—

06 References

www.cve.orghttps://www.cve.org/CVERecord?id=CVE-2021-44228
github.comhttps://github.com/apache/logging-log4j2/pull/608#issuecomment-990494126
access.redhat.comhttps://access.redhat.com/security/cve/CVE-2021-4104
www.kb.cert.orgVU#930724https://www.kb.cert.org/vuls/id/930724third-party-advisory
www.openwall.com[oss-security] 20220118 CVE-2022-23302: Deserialization of untrusted data in JMSSink in Apache Log4j 1.xhttp://www.openwall.com/lists/oss-security/2022/01/18/3mailing-list
www.oracle.comhttps://www.oracle.com/security-alerts/cpujan2022.html
psirt.global.sonicwall.comhttps://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0033
security.netapp.comhttps://security.netapp.com/advisory/ntap-20211223-0007/
www.oracle.comhttps://www.oracle.com/security-alerts/cpuapr2022.html
www.oracle.comhttps://www.oracle.com/security-alerts/cpujul2022.html
security.gentoo.orgGLSA-202209-02https://security.gentoo.org/glsa/202209-02vendor-advisory
security.gentoo.orgGLSA-202310-16https://security.gentoo.org/glsa/202310-16vendor-advisory
security.gentoo.orgGLSA-202312-02https://security.gentoo.org/glsa/202312-02vendor-advisory
security.gentoo.orgGLSA-202312-04https://security.gentoo.org/glsa/202312-04vendor-advisory

07 Fixed in

AlmaLinux 8

parfait
Fixed

A version is affected if any line below covers it.
- Affected before 0.5.4-4.module_el8.5.0+235+62ea7738
- Affected before 0.5.4-4.module_el8.5.0+2610+de2b8c0b
parfait-examples
Fixed

A version is affected if any line below covers it.
- Affected before 0.5.4-4.module_el8.5.0+235+62ea7738
- Affected before 0.5.4-4.module_el8.5.0+2610+de2b8c0b
parfait-javadoc
Fixed

A version is affected if any line below covers it.
- Affected before 0.5.4-4.module_el8.5.0+235+62ea7738
- Affected before 0.5.4-4.module_el8.5.0+2610+de2b8c0b
pcp-parfait-agent
Fixed

A version is affected if any line below covers it.
- Affected before 0.5.4-4.module_el8.5.0+235+62ea7738
- Affected before 0.5.4-4.module_el8.5.0+2610+de2b8c0b
si-units
Fixed

A version is affected if any line below covers it.
- Affected before 0.6.5-2.module_el8.5.0+235+62ea7738
- Affected before 0.6.5-2.module_el8.5.0+2610+de2b8c0b
si-units-javadoc
Fixed

A version is affected if any line below covers it.
- Affected before 0.6.5-2.module_el8.5.0+235+62ea7738
- Affected before 0.6.5-2.module_el8.5.0+2610+de2b8c0b
unit-api
Fixed

A version is affected if any line below covers it.
- Affected before 1.0-5.module_el8.5.0+235+62ea7738
- Affected before 1.0-5.module_el8.5.0+2610+de2b8c0b
unit-api-javadoc
Fixed

A version is affected if any line below covers it.
- Affected before 1.0-5.module_el8.5.0+235+62ea7738
- Affected before 1.0-5.module_el8.5.0+2610+de2b8c0b
uom-lib
Fixed

A version is affected if any line below covers it.
- Affected before 1.0.1-6.module_el8.5.0+235+62ea7738
- Affected before 1.0.1-6.module_el8.5.0+2610+de2b8c0b
uom-lib-javadoc
Fixed

A version is affected if any line below covers it.
- Affected before 1.0.1-6.module_el8.5.0+235+62ea7738
- Affected before 1.0.1-6.module_el8.5.0+2610+de2b8c0b
uom-parent
Fixed

A version is affected if any line below covers it.
- Affected before 1.0.3-3.module_el8.5.0+235+62ea7738
- Affected before 1.0.3-3.module_el8.5.0+2610+de2b8c0b
uom-se
Fixed

A version is affected if any line below covers it.
- Affected before 1.0.4-3.module_el8.5.0+235+62ea7738
- Affected before 1.0.4-3.module_el8.5.0+2610+de2b8c0b
uom-se-javadoc
Fixed

A version is affected if any line below covers it.
- Affected before 1.0.4-3.module_el8.5.0+235+62ea7738
- Affected before 1.0.4-3.module_el8.5.0+2610+de2b8c0b
uom-systems
Fixed

A version is affected if any line below covers it.
- Affected before 0.7-1.module_el8.5.0+235+62ea7738
- Affected before 0.7-1.module_el8.5.0+2610+de2b8c0b
uom-systems-javadoc
Fixed

A version is affected if any line below covers it.
- Affected before 0.7-1.module_el8.5.0+235+62ea7738
- Affected before 0.7-1.module_el8.5.0+2610+de2b8c0b

CloudLinux 8

parfait
Fixed

A version is affected if any line below covers it.
- Affected before 0.5.4-4.module_el8.5.0+235+62ea7738
- Affected before 0.5.4-4.module_el8.5.0+2610+de2b8c0b
parfait-examples
Fixed

A version is affected if any line below covers it.
- Affected before 0.5.4-4.module_el8.5.0+235+62ea7738
- Affected before 0.5.4-4.module_el8.5.0+2610+de2b8c0b
parfait-javadoc
Fixed

A version is affected if any line below covers it.
- Affected before 0.5.4-4.module_el8.5.0+235+62ea7738
- Affected before 0.5.4-4.module_el8.5.0+2610+de2b8c0b
pcp-parfait-agent
Fixed

A version is affected if any line below covers it.
- Affected before 0.5.4-4.module_el8.5.0+235+62ea7738
- Affected before 0.5.4-4.module_el8.5.0+2610+de2b8c0b
si-units
Fixed

A version is affected if any line below covers it.
- Affected before 0.6.5-2.module_el8.5.0+235+62ea7738
- Affected before 0.6.5-2.module_el8.5.0+2610+de2b8c0b
si-units-javadoc
Fixed

A version is affected if any line below covers it.
- Affected before 0.6.5-2.module_el8.5.0+235+62ea7738
- Affected before 0.6.5-2.module_el8.5.0+2610+de2b8c0b
unit-api
Fixed

A version is affected if any line below covers it.
- Affected before 1.0-5.module_el8.5.0+235+62ea7738
- Affected before 1.0-5.module_el8.5.0+2610+de2b8c0b
unit-api-javadoc
Fixed

A version is affected if any line below covers it.
- Affected before 1.0-5.module_el8.5.0+235+62ea7738
- Affected before 1.0-5.module_el8.5.0+2610+de2b8c0b
uom-lib
Fixed

A version is affected if any line below covers it.
- Affected before 1.0.1-6.module_el8.5.0+235+62ea7738
- Affected before 1.0.1-6.module_el8.5.0+2610+de2b8c0b
uom-lib-javadoc
Fixed

A version is affected if any line below covers it.
- Affected before 1.0.1-6.module_el8.5.0+235+62ea7738
- Affected before 1.0.1-6.module_el8.5.0+2610+de2b8c0b
uom-parent
Fixed

A version is affected if any line below covers it.
- Affected before 1.0.3-3.module_el8.5.0+235+62ea7738
- Affected before 1.0.3-3.module_el8.5.0+2610+de2b8c0b
uom-se
Fixed

A version is affected if any line below covers it.
- Affected before 1.0.4-3.module_el8.5.0+235+62ea7738
- Affected before 1.0.4-3.module_el8.5.0+2610+de2b8c0b
uom-se-javadoc
Fixed

A version is affected if any line below covers it.
- Affected before 1.0.4-3.module_el8.5.0+235+62ea7738
- Affected before 1.0.4-3.module_el8.5.0+2610+de2b8c0b
uom-systems
Fixed

A version is affected if any line below covers it.
- Affected before 0.7-1.module_el8.5.0+235+62ea7738
- Affected before 0.7-1.module_el8.5.0+2610+de2b8c0b
uom-systems-javadoc
Fixed

A version is affected if any line below covers it.
- Affected before 0.7-1.module_el8.5.0+235+62ea7738
- Affected before 0.7-1.module_el8.5.0+2610+de2b8c0b

Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.

Debian 12

apache-log4j1.2
Fixed in 1.2.17-11

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

apache-log4j1.2
Fixed in 1.2.17-11

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

apache-log4j1.2
Fixed in 1.2.17-11

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 18.04 LTS

apache-log4j1.2
Fixed in 1.2.17-8+deb10u1ubuntu0.1

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 20.04 LTS

apache-log4j1.2
Fixed in 1.2.17-9ubuntu0.1

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 14.04 LTS

apache-log4j1.2
Fixed in 1.2.17-4ubuntu3+esm1
Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 16.04 LTS

apache-log4j1.2
Fixed in 1.2.17-7ubuntu1+esm1
Available with Ubuntu Pro: https://ubuntu.com/pro

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.