[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"repo-stars":3,"vuln-USN-4991-1":6},{"stargazers_count":4,"fetched_at":5},7,"2026-06-05T14:55:33.319Z",{"id":7,"descriptions":8,"cisa":9,"weaknesses":10,"exploits":11,"aliases":12,"duplicate_of":9,"upstream":13,"downstream":46,"duplicates":47,"related":48,"reserved_at":9,"published_at":57,"modified_at":58,"state":9,"summary":59,"references_raw":61,"kevs":101,"epss":9,"epss_history":102,"metrics":103,"affected":104},"USN-4991-1","libxml2 vulnerabilities\n\nYunho Kim discovered that libxml2 incorrectly handled certain error\nconditions. A remote attacker could exploit this with a crafted XML file to\ncause a denial of service, or possibly cause libxml2 to expose sensitive\ninformation. This issue only affected Ubuntu 14.04 ESM, and Ubuntu 16.04\nESM. (CVE-2017-8872)\n\nZhipeng Xie discovered that libxml2 incorrectly handled certain XML\nschemas. A remote attacker could possibly use this issue to cause a denial\nof service. This issue only affected Ubuntu 14.04 ESM, Ubuntu 16.04 ESM,\nand Ubuntu 18.04 LTS. (CVE-2019-20388)\n\nIt was discovered that libxml2 incorrectly handled invalid UTF-8 input. A\nremote attacker could possibly exploit this with a crafted XML file to\ncause libxml2 to crash, resulting in a denial of service. This issue only\naffected Ubuntu 14.04 ESM, Ubuntu 16.04 ESM, Ubuntu 18.04 LTS, Ubuntu 20.04\nLTS and Ubuntu 20.10. (CVE-2020-24977)\n\nIt was discovered that libxml2 incorrectly handled invalid UTF-8 input. A\nremote attacker could possibly exploit this with a crafted XML file to\ncause libxml2 to crash, resulting in a denial of service. (CVE-2021-3517)\n\nIt was discovered that libxml2 did not properly handle certain crafted XML\nfiles. A local attacker could exploit this with a crafted input to cause\nlibxml2 to crash, resulting in a denial of service, or possibly execute\narbitrary code. (CVE-2021-3516, CVE-2021-3518)\n\nIt was discovered that libxml2 incorrectly handled error states. A remote\nattacker could exploit this with a crafted XML file to cause libxml2 to\ncrash, resulting in a denial of service. (CVE-2021-3537)\n\nSebastian Pipping discovered that libxml2 did not properly handle certain\ncrafted XML files. A remote attacker could exploit this with a crafted XML\nfile to cause libxml2 to crash, resulting in a denial of service. This\nissue only affected Ubuntu 20.04 LTS, Ubuntu 20.10, and Ubuntu 21.04.\n(CVE-2021-3541)\n",null,[],[],[],[14,16,18,20,22,24,26,28,30,32,34,36,38,40,42,44],{"_key":15},"CVE-2017-8872",{"_key":17},"CVE-2019-20388",{"_key":19},"CVE-2020-24977",{"_key":21},"CVE-2021-3516",{"_key":23},"CVE-2021-3517",{"_key":25},"CVE-2021-3518",{"_key":27},"CVE-2021-3537",{"_key":29},"CVE-2021-3541",{"_key":31},"UBUNTU-CVE-2017-8872",{"_key":33},"UBUNTU-CVE-2019-20388",{"_key":35},"UBUNTU-CVE-2020-24977",{"_key":37},"UBUNTU-CVE-2021-3516",{"_key":39},"UBUNTU-CVE-2021-3517",{"_key":41},"UBUNTU-CVE-2021-3518",{"_key":43},"UBUNTU-CVE-2021-3537",{"_key":45},"UBUNTU-CVE-2021-3541",[],[],[49,50,51,52,53,54,55,56],{"_key":31},{"_key":33},{"_key":35},{"_key":37},{"_key":39},{"_key":41},{"_key":43},{"_key":45},"2021-06-17T14:59:21Z","2026-05-20T16:03:08.281932555Z",{"cisa_kev":60,"cisa_ransomware":60,"cisa_vendor":9,"epss_severity":9,"epss_score":9,"severity":9,"severity_score":9,"severity_version":9,"severity_source":9,"severity_vector":9,"severity_status":9},false,[62,68,73,77,81,85,89,93,97],{"url":63,"sources":64,"tags":66},"https://ubuntu.com/security/notices/USN-4991-1",[65],"osv_ubuntu",[67],"Advisory",{"url":69,"sources":70,"tags":71},"https://ubuntu.com/security/CVE-2017-8872",[65],[72],"REPORT",{"url":74,"sources":75,"tags":76},"https://ubuntu.com/security/CVE-2019-20388",[65],[72],{"url":78,"sources":79,"tags":80},"https://ubuntu.com/security/CVE-2020-24977",[65],[72],{"url":82,"sources":83,"tags":84},"https://ubuntu.com/security/CVE-2021-3516",[65],[72],{"url":86,"sources":87,"tags":88},"https://ubuntu.com/security/CVE-2021-3517",[65],[72],{"url":90,"sources":91,"tags":92},"https://ubuntu.com/security/CVE-2021-3518",[65],[72],{"url":94,"sources":95,"tags":96},"https://ubuntu.com/security/CVE-2021-3537",[65],[72],{"url":98,"sources":99,"tags":100},"https://ubuntu.com/security/CVE-2021-3541",[65],[72],[],[],[],[105],{"ecosystem":106,"name":107,"vendor":108,"product":107,"cpe_part":9,"purl_type":109,"purl_namespace":108,"purl_name":107,"source":9,"versions":110},"Ubuntu","libxml2","ubuntu","deb",[111,117,120,123],{"version":112,"is_range":113,"range_type":114,"version_start":9,"version_start_type":9,"version_end":115,"version_end_type":116,"fixed_in":9},"lt2_9_1+dfsg1_3ubuntu4_13+esm2",true,"ecosystem","2.9.1+dfsg1-3ubuntu4.13+esm2","excluding",{"version":118,"is_range":113,"range_type":114,"version_start":9,"version_start_type":9,"version_end":119,"version_end_type":116,"fixed_in":9},"lt2_9_3+dfsg1_1ubuntu0_7+esm1","2.9.3+dfsg1-1ubuntu0.7+esm1",{"version":121,"is_range":113,"range_type":114,"version_start":9,"version_start_type":9,"version_end":122,"version_end_type":116,"fixed_in":9},"lt2_9_4+dfsg1_6_1ubuntu1_4","2.9.4+dfsg1-6.1ubuntu1.4",{"version":124,"is_range":113,"range_type":114,"version_start":9,"version_start_type":9,"version_end":125,"version_end_type":116,"fixed_in":9},"lt2_9_10+dfsg_5ubuntu0_20_04_1","2.9.10+dfsg-5ubuntu0.20.04.1"]