{"answers":{"affected":"It affects 3 products.","exploited":"There is no known exploitation of CVE-2011-4539 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2011-4539 is a medium-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 8 Dec 2011. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2011-4539 and fix it if it is affected.\n\nWhat it is: CVE-2011-4539 is a medium-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 8 Dec 2011. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2011-4539 in the wild and no public exploit code.\n\nAffected product: Canonical Ubuntu Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2011-4539/ (Markdown: https://insights.sbomify.com/CVE-2011-4539/index.md)","id":"CVE-2011-4539","markdown":"https://insights.sbomify.com/CVE-2011-4539/index.md","name":"CVE-2011-4539","record":{"aliases":["DEBIAN-CVE-2011-4539","GHSA-4mm2-hqgc-vvw9","RHSA-2011:1819"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"ISC DHCP server","requires_auth":"none","summary":"Remote attackers can crash the ISC DHCP daemon by sending a crafted request packet, causing a denial of service.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mitre","cpe":[{"product":"ubuntu_linux","vendor":"canonical"},{"product":"debian_linux","vendor":"debian"},{"product":"dhcp","vendor":"isc"}],"cvss":{"score":5,"severity":"medium","source":"nvd","vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","version":"2.0"},"cwes":[{"id":"CWE-20","name":"Improper Input Validation"}],"description":"dhcpd in ISC DHCP 4.x before 4.2.3-P1 and 4.1-ESV before 4.1-ESV-R4 does not properly handle regular expressions in dhcpd.conf, which allows remote attackers to cause a denial of service (daemon crash) via a crafted request packet.","ecosystems":["Red Hat:enterprise_linux:6::client","Red Hat:enterprise_linux:6::computenode","Red Hat:enterprise_linux:6::server","Red Hat:enterprise_linux:6::workstation"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Denial of service in n/a","id":"CVE-2011-4539","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"canonical:ubuntu_linux","products":["canonical:ubuntu_linux","debian:debian_linux"],"type":"denial_of_service","year":"2011"},"n_packages":20,"n_references":13,"next":{"headline":"Cross-site scripting in n/a","id":"CVE-2011-4540"},"packages":[{"ecosystem":"Red Hat:enterprise_linux:6::client","fixed":["12:4.1.1-25.P1.el6_2.1"],"introduced":["0"],"last_affected":[],"package":"dhclient","purl":"pkg:rpm/redhat/dhclient","source":"RHSA-2011:1819"},{"ecosystem":"Red Hat:enterprise_linux:6::client","fixed":["12:4.1.1-25.P1.el6_2.1"],"introduced":["0"],"last_affected":[],"package":"dhcp","purl":"pkg:rpm/redhat/dhcp","source":"RHSA-2011:1819"},{"ecosystem":"Red Hat:enterprise_linux:6::client","fixed":["12:4.1.1-25.P1.el6_2.1"],"introduced":["0"],"last_affected":[],"package":"dhcp-common","purl":"pkg:rpm/redhat/dhcp-common","source":"RHSA-2011:1819"},{"ecosystem":"Red Hat:enterprise_linux:6::client","fixed":["12:4.1.1-25.P1.el6_2.1"],"introduced":["0"],"last_affected":[],"package":"dhcp-debuginfo","purl":"pkg:rpm/redhat/dhcp-debuginfo","source":"RHSA-2011:1819"},{"ecosystem":"Red Hat:enterprise_linux:6::client","fixed":["12:4.1.1-25.P1.el6_2.1"],"introduced":["0"],"last_affected":[],"package":"dhcp-devel","purl":"pkg:rpm/redhat/dhcp-devel","source":"RHSA-2011:1819"},{"ecosystem":"Red Hat:enterprise_linux:6::computenode","fixed":["12:4.1.1-25.P1.el6_2.1"],"introduced":["0"],"last_affected":[],"package":"dhclient","purl":"pkg:rpm/redhat/dhclient","source":"RHSA-2011:1819"},{"ecosystem":"Red Hat:enterprise_linux:6::computenode","fixed":["12:4.1.1-25.P1.el6_2.1"],"introduced":["0"],"last_affected":[],"package":"dhcp","purl":"pkg:rpm/redhat/dhcp","source":"RHSA-2011:1819"},{"ecosystem":"Red Hat:enterprise_linux:6::computenode","fixed":["12:4.1.1-25.P1.el6_2.1"],"introduced":["0"],"last_affected":[],"package":"dhcp-common","purl":"pkg:rpm/redhat/dhcp-common","source":"RHSA-2011:1819"},{"ecosystem":"Red Hat:enterprise_linux:6::computenode","fixed":["12:4.1.1-25.P1.el6_2.1"],"introduced":["0"],"last_affected":[],"package":"dhcp-debuginfo","purl":"pkg:rpm/redhat/dhcp-debuginfo","source":"RHSA-2011:1819"},{"ecosystem":"Red Hat:enterprise_linux:6::computenode","fixed":["12:4.1.1-25.P1.el6_2.1"],"introduced":["0"],"last_affected":[],"package":"dhcp-devel","purl":"pkg:rpm/redhat/dhcp-devel","source":"RHSA-2011:1819"},{"ecosystem":"Red Hat:enterprise_linux:6::server","fixed":["12:4.1.1-25.P1.el6_2.1"],"introduced":["0"],"last_affected":[],"package":"dhclient","purl":"pkg:rpm/redhat/dhclient","source":"RHSA-2011:1819"},{"ecosystem":"Red Hat:enterprise_linux:6::server","fixed":["12:4.1.1-25.P1.el6_2.1"],"introduced":["0"],"last_affected":[],"package":"dhcp","purl":"pkg:rpm/redhat/dhcp","source":"RHSA-2011:1819"},{"ecosystem":"Red Hat:enterprise_linux:6::server","fixed":["12:4.1.1-25.P1.el6_2.1"],"introduced":["0"],"last_affected":[],"package":"dhcp-common","purl":"pkg:rpm/redhat/dhcp-common","source":"RHSA-2011:1819"},{"ecosystem":"Red Hat:enterprise_linux:6::server","fixed":["12:4.1.1-25.P1.el6_2.1"],"introduced":["0"],"last_affected":[],"package":"dhcp-debuginfo","purl":"pkg:rpm/redhat/dhcp-debuginfo","source":"RHSA-2011:1819"},{"ecosystem":"Red Hat:enterprise_linux:6::server","fixed":["12:4.1.1-25.P1.el6_2.1"],"introduced":["0"],"last_affected":[],"package":"dhcp-devel","purl":"pkg:rpm/redhat/dhcp-devel","source":"RHSA-2011:1819"},{"ecosystem":"Red Hat:enterprise_linux:6::workstation","fixed":["12:4.1.1-25.P1.el6_2.1"],"introduced":["0"],"last_affected":[],"package":"dhclient","purl":"pkg:rpm/redhat/dhclient","source":"RHSA-2011:1819"},{"ecosystem":"Red Hat:enterprise_linux:6::workstation","fixed":["12:4.1.1-25.P1.el6_2.1"],"introduced":["0"],"last_affected":[],"package":"dhcp","purl":"pkg:rpm/redhat/dhcp","source":"RHSA-2011:1819"},{"ecosystem":"Red Hat:enterprise_linux:6::workstation","fixed":["12:4.1.1-25.P1.el6_2.1"],"introduced":["0"],"last_affected":[],"package":"dhcp-common","purl":"pkg:rpm/redhat/dhcp-common","source":"RHSA-2011:1819"},{"ecosystem":"Red Hat:enterprise_linux:6::workstation","fixed":["12:4.1.1-25.P1.el6_2.1"],"introduced":["0"],"last_affected":[],"package":"dhcp-debuginfo","purl":"pkg:rpm/redhat/dhcp-debuginfo","source":"RHSA-2011:1819"},{"ecosystem":"Red Hat:enterprise_linux:6::workstation","fixed":["12:4.1.1-25.P1.el6_2.1"],"introduced":["0"],"last_affected":[],"package":"dhcp-devel","purl":"pkg:rpm/redhat/dhcp-devel","source":"RHSA-2011:1819"}],"prev":{"headline":"Information disclosure in n/a","id":"CVE-2011-4538"},"products":["n/a"],"published":"2011-12-08","related":[{"cvss_score":9.8,"headline":"SaltStack Salt Authentication Bypass","id":"CVE-2020-11651","kev_date_added":"2021-11-03","published":"2020-04-30"},{"cvss_score":9.8,"headline":"OpenSMTPD Remote Code Execution","id":"CVE-2020-7247","kev_date_added":"2022-03-25","published":"2020-01-29"},{"cvss_score":9.8,"headline":"Exim Out-of-bounds Write","id":"CVE-2019-16928","kev_date_added":"2022-03-03","published":"2019-09-27"},{"cvss_score":9.8,"headline":"Exim Buffer Overflow","id":"CVE-2018-6789","kev_date_added":"2021-11-03","published":"2018-02-08"},{"cvss_score":9.8,"headline":"Oracle Java SE and Java SE Embedded Remote Code Execution","id":"CVE-2015-2590","kev_date_added":"2022-03-03","published":"2015-07-16"},{"cvss_score":9.8,"headline":"Oracle JRE Remote Code Execution","id":"CVE-2013-0422","kev_date_added":"2022-05-25","published":"2013-01-10"},{"cvss_score":9.8,"headline":"Oracle Java SE Runtime Environment (JRE) Arbitrary Code Execution","id":"CVE-2011-3544","kev_date_added":"2022-03-03","published":"2011-10-19"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"Red Hat","prefix":"RHSA"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-08-07","vendors":["n/a"]},"summary":"Remote attackers can crash the ISC DHCP daemon by sending a crafted request packet, causing a denial of service.","url":"https://insights.sbomify.com/CVE-2011-4539/"}