{"id":"USN-4994-2","summary":"apache2 vulnerabilities","details":"USN-4994-1 fixed several vulnerabilities in Apache. This update provides\nthe corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.\n\nOriginal advisory details:\n\n Antonio Morales discovered that the Apache mod_auth_digest module\n incorrectly handled certain Digest nonces. A remote attacker could possibly\n use this issue to cause Apache to crash, resulting in a denial of service.\n (CVE-2020-35452)\n\n Antonio Morales discovered that the Apache mod_session module incorrectly\n handled certain Cookie headers. A remote attacker could possibly use this\n issue to cause Apache to crash, resulting in a denial of service.\n (CVE-2021-26690)\n\n Christophe Jaillet discovered that the Apache mod_session module\n incorrectly handled certain SessionHeader values. A remote attacker could\n use this issue to cause Apache to crash, resulting in a denial of service,\n or possibly execute arbitrary code. (CVE-2021-26691)\n\n Christoph Anton Mitterer discovered that the new MergeSlashes configuration\n option resulted in unexpected behaviour in certain situations.\n (CVE-2021-30641)\n","modified":"2026-04-22T10:30:33.364132Z","published":"2021-06-21T15:25:05Z","related":["UBUNTU-CVE-2020-35452","UBUNTU-CVE-2021-26690","UBUNTU-CVE-2021-26691","UBUNTU-CVE-2021-30641"],"upstream":["CVE-2020-35452","CVE-2021-26690","CVE-2021-26691","CVE-2021-30641","UBUNTU-CVE-2020-35452","UBUNTU-CVE-2021-26690","UBUNTU-CVE-2021-26691","UBUNTU-CVE-2021-30641"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4994-2"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-35452"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-26690"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-26691"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-30641"}],"affected":[{"package":{"name":"apache2","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/apache2@2.4.7-1ubuntu4.22+esm1?arch=source&distro=trusty/esm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.7-1ubuntu4.22+esm1"}]}],"versions":["2.4.6-2ubuntu2","2.4.6-2ubuntu3","2.4.6-2ubuntu4","2.4.7-1ubuntu1","2.4.7-1ubuntu2","2.4.7-1ubuntu3","2.4.7-1ubuntu4","2.4.7-1ubuntu4.1","2.4.7-1ubuntu4.4","2.4.7-1ubuntu4.5","2.4.7-1ubuntu4.6","2.4.7-1ubuntu4.7","2.4.7-1ubuntu4.8","2.4.7-1ubuntu4.9","2.4.7-1ubuntu4.10","2.4.7-1ubuntu4.11","2.4.7-1ubuntu4.13","2.4.7-1ubuntu4.15","2.4.7-1ubuntu4.16","2.4.7-1ubuntu4.17","2.4.7-1ubuntu4.18","2.4.7-1ubuntu4.19","2.4.7-1ubuntu4.20","2.4.7-1ubuntu4.21","2.4.7-1ubuntu4.22"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_name":"apache2","binary_version":"2.4.7-1ubuntu4.22+esm1"},{"binary_name":"apache2-bin","binary_version":"2.4.7-1ubuntu4.22+esm1"},{"binary_name":"apache2-data","binary_version":"2.4.7-1ubuntu4.22+esm1"},{"binary_name":"apache2-mpm-event","binary_version":"2.4.7-1ubuntu4.22+esm1"},{"binary_name":"apache2-mpm-itk","binary_version":"2.4.7-1ubuntu4.22+esm1"},{"binary_name":"apache2-mpm-prefork","binary_version":"2.4.7-1ubuntu4.22+esm1"},{"binary_name":"apache2-mpm-worker","binary_version":"2.4.7-1ubuntu4.22+esm1"},{"binary_name":"apache2-suexec","binary_version":"2.4.7-1ubuntu4.22+esm1"},{"binary_name":"apache2-suexec-custom","binary_version":"2.4.7-1ubuntu4.22+esm1"},{"binary_name":"apache2-suexec-pristine","binary_version":"2.4.7-1ubuntu4.22+esm1"},{"binary_name":"apache2-utils","binary_version":"2.4.7-1ubuntu4.22+esm1"},{"binary_name":"apache2.2-bin","binary_version":"2.4.7-1ubuntu4.22+esm1"},{"binary_name":"libapache2-mod-macro","binary_version":"1:2.4.7-1ubuntu4.22+esm1"},{"binary_name":"libapache2-mod-proxy-html","binary_version":"1:2.4.7-1ubuntu4.22+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4994-2.json","cves_map":{"ecosystem":"Ubuntu:Pro:14.04:LTS","cves":[{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L"},{"type":"Ubuntu","score":"low"}],"id":"CVE-2020-35452"},{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2021-26690"},{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2021-26691"},{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2021-30641"}]}}},{"package":{"name":"apache2","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/apache2@2.4.18-2ubuntu3.17+esm1?arch=source&distro=esm-infra/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.18-2ubuntu3.17+esm1"}]}],"versions":["2.4.12-2ubuntu2","2.4.17-1ubuntu1","2.4.17-2ubuntu1","2.4.17-3ubuntu1","2.4.18-1ubuntu1","2.4.18-2ubuntu1","2.4.18-2ubuntu2","2.4.18-2ubuntu3","2.4.18-2ubuntu3.1","2.4.18-2ubuntu3.2","2.4.18-2ubuntu3.3","2.4.18-2ubuntu3.4","2.4.18-2ubuntu3.5","2.4.18-2ubuntu3.7","2.4.18-2ubuntu3.8","2.4.18-2ubuntu3.9","2.4.18-2ubuntu3.10","2.4.18-2ubuntu3.12","2.4.18-2ubuntu3.13","2.4.18-2ubuntu3.14","2.4.18-2ubuntu3.15","2.4.18-2ubuntu3.17"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_name":"apache2","binary_version":"2.4.18-2ubuntu3.17+esm1"},{"binary_name":"apache2-bin","binary_version":"2.4.18-2ubuntu3.17+esm1"},{"binary_name":"apache2-data","binary_version":"2.4.18-2ubuntu3.17+esm1"},{"binary_name":"apache2-suexec-custom","binary_version":"2.4.18-2ubuntu3.17+esm1"},{"binary_name":"apache2-suexec-pristine","binary_version":"2.4.18-2ubuntu3.17+esm1"},{"binary_name":"apache2-utils","binary_version":"2.4.18-2ubuntu3.17+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4994-2.json","cves_map":{"ecosystem":"Ubuntu:Pro:16.04:LTS","cves":[{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L"},{"type":"Ubuntu","score":"low"}],"id":"CVE-2020-35452"},{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2021-26690"},{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2021-26691"},{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2021-30641"}]}}}],"schema_version":"1.7.5"}