Apache Ant vulnerabilities

5 CVEs affecting Apache Ant, 0 known to be exploited (CISA KEV), with EPSS scores. Latest: CVE-2026-78254, published 2026-09-07.

Highest priority

Known exploited (CISA KEV) first, then by EPSS exploit probability.

CVE-2020-11979, published 2020-10-01. High severity, CVSS 7.5. EPSS: 8% chance of exploitation in the next 30 days. As mitigation for CVE-2020-1945 Apache Ant 1.10.8 changed the permissions of temporary files it created so that only the current user was allowed to access them. Unfortunately the fixcrlf task…
CVE-2021-36374, published 2021-07-14. Medium severity, CVSS 5.5. EPSS: 2.6% chance of exploitation in the next 30 days. When reading a specially crafted ZIP archive, or a derived formats, an Apache Ant build can be made to allocate large amounts of memory that leads to an out of memory error, even for small inputs.…
CVE-2021-36373, published 2021-07-14. Medium severity, CVSS 5.5. EPSS: 2.5% chance of exploitation in the next 30 days. When reading a specially crafted TAR archive an Apache Ant build can be made to allocate large amounts of memory that finally leads to an out of memory error, even for small inputs. This can be used…
CVE-2020-1945, published 2020-05-14. Medium severity, CVSS 6.3. EPSS: 1.8% chance of exploitation in the next 30 days. Apache Ant 1.1 to 1.9.14 and 1.10.0 to 1.10.7 uses the default temporary directory identified by the Java system property java.io.tmpdir for several tasks and may thus leak sensitive information. The…
CVE-2026-78254, published 2026-09-07. High severity, CVSS 7.4. EPSS: 0.5% chance of exploitation in the next 30 days. The ftp and scp tasks of Apache Ant can download files from a remote server. A malicious server can provide relative paths that allow it to write outside of the dedicated target directory for the…