{"id":"USN-4994-1","summary":"apache2 vulnerabilities","details":"Marc Stern discovered that the Apache mod_proxy_http module incorrectly\nhandled certain requests. A remote attacker could possibly use this issue\nto cause Apache to crash, resulting in a denial of service. This issue only\naffected Ubuntu 20.04 LTS, Ubuntu 20.10, and Ubuntu 21.04. (CVE-2020-13950)\n\nAntonio Morales discovered that the Apache mod_auth_digest module\nincorrectly handled certain Digest nonces. A remote attacker could possibly\nuse this issue to cause Apache to crash, resulting in a denial of service.\n(CVE-2020-35452)\n\nAntonio Morales discovered that the Apache mod_session module incorrectly\nhandled certain Cookie headers. A remote attacker could possibly use this\nissue to cause Apache to crash, resulting in a denial of service.\n(CVE-2021-26690)\n\nChristophe Jaillet discovered that the Apache mod_session module\nincorrectly handled certain SessionHeader values. A remote attacker could\nuse this issue to cause Apache to crash, resulting in a denial of service,\nor possibly execute arbitrary code. (CVE-2021-26691)\n\nChristoph Anton Mitterer discovered that the new MergeSlashes configuration\noption resulted in unexpected behaviour in certain situations.\n(CVE-2021-30641)\n","modified":"2026-02-10T04:42:14Z","published":"2021-06-21T14:01:37Z","related":["UBUNTU-CVE-2020-13950","UBUNTU-CVE-2020-35452","UBUNTU-CVE-2021-26690","UBUNTU-CVE-2021-26691","UBUNTU-CVE-2021-30641"],"upstream":["CVE-2020-13950","CVE-2020-35452","CVE-2021-26690","CVE-2021-26691","CVE-2021-30641","UBUNTU-CVE-2020-13950","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-4994-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-13950"},{"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:18.04:LTS","purl":"pkg:deb/ubuntu/apache2@2.4.29-1ubuntu4.16?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.29-1ubuntu4.16"}]}],"versions":["2.4.27-2ubuntu3","2.4.29-1ubuntu1","2.4.29-1ubuntu2","2.4.29-1ubuntu3","2.4.29-1ubuntu4","2.4.29-1ubuntu4.1","2.4.29-1ubuntu4.2","2.4.29-1ubuntu4.3","2.4.29-1ubuntu4.4","2.4.29-1ubuntu4.5","2.4.29-1ubuntu4.6","2.4.29-1ubuntu4.7","2.4.29-1ubuntu4.8","2.4.29-1ubuntu4.10","2.4.29-1ubuntu4.11","2.4.29-1ubuntu4.12","2.4.29-1ubuntu4.13","2.4.29-1ubuntu4.14"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"apache2","binary_version":"2.4.29-1ubuntu4.16"},{"binary_name":"apache2-bin","binary_version":"2.4.29-1ubuntu4.16"},{"binary_name":"apache2-data","binary_version":"2.4.29-1ubuntu4.16"},{"binary_name":"apache2-dev","binary_version":"2.4.29-1ubuntu4.16"},{"binary_name":"apache2-ssl-dev","binary_version":"2.4.29-1ubuntu4.16"},{"binary_name":"apache2-suexec-custom","binary_version":"2.4.29-1ubuntu4.16"},{"binary_name":"apache2-suexec-pristine","binary_version":"2.4.29-1ubuntu4.16"},{"binary_name":"apache2-utils","binary_version":"2.4.29-1ubuntu4.16"}]},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:18.04: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"}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4994-1.json"}},{"package":{"name":"apache2","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/apache2@2.4.41-4ubuntu3.3?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.41-4ubuntu3.3"}]}],"versions":["2.4.41-1ubuntu1","2.4.41-4ubuntu1","2.4.41-4ubuntu2","2.4.41-4ubuntu3","2.4.41-4ubuntu3.1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"apache2","binary_version":"2.4.41-4ubuntu3.3"},{"binary_name":"apache2-bin","binary_version":"2.4.41-4ubuntu3.3"},{"binary_name":"apache2-data","binary_version":"2.4.41-4ubuntu3.3"},{"binary_name":"apache2-dev","binary_version":"2.4.41-4ubuntu3.3"},{"binary_name":"apache2-ssl-dev","binary_version":"2.4.41-4ubuntu3.3"},{"binary_name":"apache2-suexec-custom","binary_version":"2.4.41-4ubuntu3.3"},{"binary_name":"apache2-suexec-pristine","binary_version":"2.4.41-4ubuntu3.3"},{"binary_name":"apache2-utils","binary_version":"2.4.41-4ubuntu3.3"},{"binary_name":"libapache2-mod-md","binary_version":"2.4.41-4ubuntu3.3"},{"binary_name":"libapache2-mod-proxy-uwsgi","binary_version":"2.4.41-4ubuntu3.3"}]},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:20.04:LTS","cves":[{"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":"low"}],"id":"CVE-2020-13950"},{"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"}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4994-1.json"}}],"schema_version":"1.7.3"}