Technology · Apache Software Foundation
Apache Software Foundation Log4j Core vulnerabilities
Updated . Rebuilt every hour.
Junglewise Threat Intelligence has tracked 3 vulnerabilities in Apache Software Foundation Log4j Core: 0 in the last 7 days and 0 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-34480, was published on 10 April 2026.
- Last 7 days
- 0
- Last 90 days
- 0
- Critical, all time
- 0
- Exploited in the wild
- 0
About Apache Software Foundation Log4j Core
Core logging library for Apache Log4j framework.
Latest Apache Software Foundation Log4j Core vulnerabilities
- CVE-2026-34480: Apache Log4j Core invalid XML output in XmlLayouthighCVSS 7.5EPSS 1.2%
- CVE-2021-44832: Apache Log4j2 remote code execution via JDBC Appender JNDI injectionmediumCVSS 6.6EPSS 97.9%
- CVE-2020-9488: Apache Log4j improper certificate validation in SMTP appenderlowCVSS 3.7EPSS 8.1%
Most severe Apache Software Foundation Log4j Core vulnerabilities
Exploited in the wild first, then by severity and CVSS score.
- CVE-2026-34480: Apache Log4j Core invalid XML output in XmlLayouthighCVSS 7.5EPSS 1.2%
- CVE-2021-44832: Apache Log4j2 remote code execution via JDBC Appender JNDI injectionmediumCVSS 6.6EPSS 97.9%
- CVE-2020-9488: Apache Log4j improper certificate validation in SMTP appenderlowCVSS 3.7EPSS 8.1%
Vulnerabilities per week
Nothing was published in the last eight weeks. The last 13 weeks, by the week each vulnerability was published.
| Week of | Bar | Vulns | Critical |
|---|---|---|---|
| 17 Aug 2026 | 0 | 0 | |
| 24 Aug 2026 | 0 | 0 | |
| 31 Aug 2026 | 0 | 0 | |
| 7 Sep 2026 | 0 | 0 | |
| 14 Sep 2026 | 0 | 0 | |
| 21 Sep 2026 | 0 | 0 | |
| 28 Sep 2026 | 0 | 0 | |
| 5 Oct 2026 | 0 | 0 | |
| 12 Oct 2026 | 0 | 0 | |
| 19 Oct 2026 | 0 | 0 | |
| 26 Oct 2026 | 0 | 0 | |
| 2 Nov 2026 | 0 | 0 | |
| 9 Nov 2026 | 0 | 0 |
Embed a badge
A live badge for a README, a status page or an internal wiki: how many Apache Software Foundation Log4j Core vulnerabilities were published in the last 7 days and how many of them are critical, refreshed hourly.
[](https://junglewise.ai/threats/technologies/log4j-core)<a href="https://junglewise.ai/threats/technologies/log4j-core"><img src="https://junglewise.ai/threats/technologies/log4j-core/badge.svg" alt="Apache Software Foundation Log4j Core vulnerabilities" /></a>How this is built
Junglewise Threat Intelligence collects vulnerabilities from NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories, and matches each one to the technologies and vendors it affects. Dates are the date a vulnerability was published, in UTC.
The pages are rebuilt from the database every hour. Frozen weekly and monthly reports never change once published, so they can be cited.
Use this data
The same data is at https://junglewise.ai/threats/technologies/log4j-core.json, and this page as text at https://junglewise.ai/threats/technologies/log4j-core.md, for scripts and language models. It is free to reuse under CC BY 4.0 with a link back to this page.
Cite as: Junglewise Threat Intelligence, "Apache Software Foundation Log4j Core vulnerabilities", https://junglewise.ai/threats/technologies/log4j-core, 9 November 2026.