CVE-2021-4104

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

81.15% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 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.

Published

2021-12-14 00:00Z4 YR AGO

Last updated

2026-05-28 19:53Z3 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

• 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