{"schemaVersion":3,"id":"CVE-2011-2516","aliases":["UBUNTU-CVE-2011-2516","DEBIAN-CVE-2011-2516","DSA-2277-1"],"status":"published","duplicateOf":null,"title":null,"description":"Off-by-one error in the XML signature feature in Apache XML Security for C++ 1.6.0, as used in Shibboleth before 2.4.3 and possibly other products, allows remote attackers to cause a denial of service (crash) via a signature using a large RSA key, which triggers a buffer overflow.","dates":{"published":"2011-07-11T20:00:00.000Z","modified":"2024-08-06T23:00:34.179Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":5,"severity":"medium","version":"2.0","versionLabel":"v2.0","source":"NVD","vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","computed":false,"selection":"backend-summary"},"metrics":[{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":5,"severity":"medium","vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.0772,"percentile":0.94568,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-19T00:00:00.000Z","baselineScore":0.0772},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.0772,"percentile":0.94568}],"last30":[{"date":"2026-09-19T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.0772,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.0772,"percentile":0.94568}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[{"id":"REF_6EA22AED2AEB5AFA","name":"Exploit Reference (issues.apache.org)","source":"reference","url":"https://issues.apache.org/jira/browse/SANTUARIO-271","maturity":"unknown","reliabilityScore":0.2,"verified":false,"type":null,"platforms":[],"requiresAuth":null,"exploitdb":null,"metasploit":null}],"exploitCount":1,"weaknesses":[{"id":"CWE-189","name":"Numeric Errors","description":"Weaknesses in this category are related to improper calculation or conversion of numbers.","type":"category","status":"Draft","abstraction":null,"likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/189.html"}],"affected":[{"vendor":"apache","product":"xml_security_for_c\\+\\+","name":"xml security for c\\+\\+","label":"xml_security_for_c\\+\\+","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"1.6.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"1.6.0","eol":null,"hubHref":"/vendor/apache/xml_security_for_c"},{"vendor":"debian","product":"xml-security-c","name":"xml-security-c","label":"xml-security-c","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/xml-security-c","purlType":"deb","versions":[{"text":"< 1.6.1-1","noFixRecorded":false,"fixedIn":null},{"text":"< 1.4.0-3+lenny3","noFixRecorded":false,"fixedIn":null},{"text":"< 1.5.1-3+squeeze1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1.6.1-1 | < 1.4.0-3+lenny3 | < 1.5.1-3+squeeze1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"shibboleth-sp2","name":"shibboleth-sp2","label":"shibboleth-sp2","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/shibboleth-sp2","purlType":"deb","versions":[{"text":"< 2.5.2+dfsg-2","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2.5.2+dfsg-2","eol":null,"hubHref":null},{"vendor":"shibboleth","product":"shibboleth-sp","name":"shibboleth-sp","label":"shibboleth-sp","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≤ 2.4.2","noFixRecorded":false,"fixedIn":null},{"text":"1.3.1","noFixRecorded":false,"fixedIn":null},{"text":"1.3.2","noFixRecorded":false,"fixedIn":null},{"text":"1.3.3","noFixRecorded":false,"fixedIn":null},{"text":"1.3.4","noFixRecorded":false,"fixedIn":null},{"text":"1.3.5","noFixRecorded":false,"fixedIn":null},{"text":"1.3f","noFixRecorded":false,"fixedIn":null},{"text":"2.0","noFixRecorded":false,"fixedIn":null},{"text":"2.1","noFixRecorded":false,"fixedIn":null},{"text":"2.2","noFixRecorded":false,"fixedIn":null},{"text":"2.2.1","noFixRecorded":false,"fixedIn":null},{"text":"2.3","noFixRecorded":false,"fixedIn":null},{"text":"2.3.1","noFixRecorded":false,"fixedIn":null},{"text":"2.4","noFixRecorded":false,"fixedIn":null},{"text":"2.4.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"≤ 2.4.2 | 1.3.1 | 1.3.2 | 1.3.3 | 1.3.4 | 1.3.5 | 1.3f | 2.0 | 2.1 | 2.2 | 2.2.1 | 2.3 | 2.3.1 | 2.4 | 2.4.1","eol":null,"hubHref":"/vendor/shibboleth/shibboleth-sp"}],"affectedCount":4,"eol":{"hasEol":false,"count":0},"references":[{"url":"http://www.debian.org/security/2011/dsa-2277","label":"www.debian.org/security/2011/dsa-2277","hostname":"www.debian.org","tags":["Vendor Advisory","X Refsource DEBIAN"]},{"url":"http://secunia.com/advisories/45491","label":"secunia.com/advisories/45491","hostname":"secunia.com","tags":["Third Party Advisory","X Refsource SECUNIA"]},{"url":"http://secunia.com/advisories/45151","label":"secunia.com/advisories/45151","hostname":"secunia.com","tags":["Third Party Advisory","X Refsource SECUNIA","Vendor Advisory"]},{"url":"http://www.securityfocus.com/archive/1/518756/100/0/threaded","label":"www.securityfocus.com/archive/1/518756/100/0/threaded","hostname":"www.securityfocus.com","tags":["Mailing List","X Refsource BUGTRAQ"]},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/68420","label":"exchange.xforce.ibmcloud.com/vulnerabilities/68420","hostname":"exchange.xforce.ibmcloud.com","tags":["VDB Entry","X Refsource XF"]},{"url":"https://issues.apache.org/jira/browse/SANTUARIO-271","label":"issues.apache.org/jira/browse/SANTUARIO-271","hostname":"issues.apache.org","tags":["X Refsource CONFIRM","Exploit"]},{"url":"http://santuario.apache.org/secadv/CVE-2011-2516.txt","label":"santuario.apache.org/secadv/CVE-2011-2516.txt","hostname":"santuario.apache.org","tags":["X Refsource CONFIRM","Vendor Advisory","REPORT"]},{"url":"http://lists.fedoraproject.org/pipermail/package-announce/2011-July/063159.html","label":"lists.fedoraproject.org/pipermail/package-announce/2011-July/063159.html","hostname":"lists.fedoraproject.org","tags":["Vendor Advisory","X Refsource FEDORA"]},{"url":"http://secunia.com/advisories/45198","label":"secunia.com/advisories/45198","hostname":"secunia.com","tags":["Third Party Advisory","X Refsource SECUNIA"]},{"url":"http://secunia.com/advisories/45191","label":"secunia.com/advisories/45191","hostname":"secunia.com","tags":["Third Party Advisory","X Refsource SECUNIA","Vendor Advisory"]},{"url":"http://shibboleth.internet2.edu/secadv/secadv_20110706.txt","label":"shibboleth.internet2.edu/secadv/secadv_20110706.txt","hostname":"shibboleth.internet2.edu","tags":["X Refsource CONFIRM","Vendor Advisory"]},{"url":"http://www.securitytracker.com/id?1025755","label":"www.securitytracker.com/id?1025755","hostname":"www.securitytracker.com","tags":["VDB Entry","X Refsource SECTRACK"]},{"url":"http://lists.fedoraproject.org/pipermail/package-announce/2011-July/063229.html","label":"lists.fedoraproject.org/pipermail/package-announce/2011-July/063229.html","hostname":"lists.fedoraproject.org","tags":["Vendor Advisory","X Refsource FEDORA"]},{"url":"http://www.securityfocus.com/bid/48611","label":"www.securityfocus.com/bid/48611","hostname":"www.securityfocus.com","tags":["VDB Entry","X Refsource BID"]},{"url":"https://lists.apache.org/thread.html/680e6938b6412e26d5446054fd31de2011d33af11786b989127d1cc3%40%3Ccommits.santuario.apache.org%3E","label":"lists.apache.org/thread.html/…","hostname":"lists.apache.org","tags":["Mailing List","X Refsource MLIST"]},{"url":"https://lists.apache.org/thread.html/r1c07a561426ec5579073046ad7f4207cdcef452bb3100abaf908e0cd%40%3Ccommits.santuario.apache.org%3E","label":"lists.apache.org/thread.html/…","hostname":"lists.apache.org","tags":["Mailing List","X Refsource MLIST"]},{"url":"https://ubuntu.com/security/CVE-2011-2516","label":"ubuntu.com/security/CVE-2011-2516","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2011-2516","label":"www.cve.org/CVERecord?id=CVE-2011-2516","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2011-2516","label":"security-tracker.debian.org/tracker/CVE-2011-2516","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2011-07-11T20:00:00.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2024-08-06T23:00:34.179Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":32,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T11:49:46.814Z","stale":false,"partial":false}}