{"id":"CVE-2011-1756","aliases":["DEBIAN-CVE-2011-1756","DSA-2250-1","EUVD-2011-1755","GHSA-6px8-r2g4-9v5v","UBUNTU-CVE-2011-1756"],"status":"published","title":"modules/xmpp/serv_xmpp.c in Citadel 7.86 and earlier does not properly detect recursion during...","description":"modules/xmpp/serv_xmpp.c in Citadel 7.86 and earlier does not properly detect recursion during entity expansion, which allows remote attackers to cause a denial of service (memory and CPU consumption) via a crafted XML document containing a large number of nested entity references, a similar issue to CVE-2003-1564.","severity":{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.0266,"percentile":0.85791,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-399"],"published":"2011-05-31T00:00:00Z","modified":"2026-06-16T23:29:58Z","fixes":[{"ecosystem":"Debian:6.0","package":"citadel","fixed_in":["7.83-2squeeze2"],"sources":["osv"]},{"ecosystem":"Debian:5.0","package":"citadel","fixed_in":["7.37-8+lenny1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:6.0","package":"citadel","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.83-2squeeze2"}]}],"versions":["7.83-2squeeze1"]},{"source":"osv","ecosystem":"Debian:5.0","package":"citadel","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.37-8+lenny1"}]}],"versions":["7.37-8"]}],"products":[{"vendor":"citadel","product":"citadel"}],"references":[{"url":"http://code.citadel.org/cgit.cgi/git.citadel.org/commit/?id=27c991cc2059f5530d3d4e9689dc976b745f5b0c","tags":["x_refsource_CONFIRM","x_transferred","Patch"]},{"url":"http://www.securityfocus.com/bid/48071","tags":["vdb-entry","x_refsource_BID","x_transferred"]},{"url":"http://packages.debian.org/changelogs/pool/main/c/citadel/citadel_7.37-8+lenny1/changelog","tags":["x_refsource_CONFIRM","x_transferred"]},{"url":"http://www.debian.org/security/2011/dsa-2250","tags":["vendor-advisory","x_refsource_DEBIAN","x_transferred"]},{"url":"http://security.debian.org/debian-security/pool/updates/main/c/citadel/citadel_7.83-2squeeze2.diff.gz","tags":["x_refsource_CONFIRM","x_transferred","Patch"]},{"url":"http://secunia.com/advisories/44788","tags":["third-party-advisory","x_refsource_SECUNIA","x_transferred","Vendor Advisory"]},{"url":"http://packages.debian.org/changelogs/pool/main/c/citadel/citadel_7.83-2squeeze2/changelog","tags":["x_refsource_CONFIRM","x_transferred"]},{"url":"http://code.citadel.org/cgit.cgi/git.citadel.org/commit/?id=95040add546a705cc2d1d8f16293141f9f9845a6","tags":["x_refsource_CONFIRM","x_transferred","Patch"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2011-1756"},{"url":"https://github.com/advisories/GHSA-6px8-r2g4-9v5v"},{"url":"https://ubuntu.com/security/CVE-2011-1756","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2011-1756","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2011-1756","description":"modules/xmpp/serv_xmpp.c in Citadel 7.86 and earlier does not properly detect recursion during entity expansion, which allows remote attackers to cause a denial of service (memory and CPU consumption) via a crafted XML document containing a large number of nested entity references, a similar issue to CVE-2003-1564.","status":"published","published":"2011-06-21T01:00:00Z","modified":"2024-08-06T22:37:25.682Z","updated_at":"2026-11-02T14:35:38.321377Z"}],"euvd":[{"id":"EUVD-2011-1755","description":"modules/xmpp/serv_xmpp.c in Citadel 7.86 and earlier does not properly detect recursion during entity expansion, which allows remote attackers to cause a denial of service (memory and CPU consumption) via a crafted XML document containing a large number of nested entity references, a similar issue to CVE-2003-1564.","status":"published","published":"2011-06-21T01:00:00Z","modified":"2024-08-06T22:37:25Z","updated_at":"2026-11-03T01:55:55.207376Z"}],"ghsa":[{"id":"GHSA-6px8-r2g4-9v5v","title":"modules/xmpp/serv_xmpp.c in Citadel 7.86 and earlier does not properly detect recursion during...","description":"modules/xmpp/serv_xmpp.c in Citadel 7.86 and earlier does not properly detect recursion during entity expansion, which allows remote attackers to cause a denial of service (memory and CPU consumption) via a crafted XML document containing a large number of nested entity references, a similar issue to CVE-2003-1564.","status":"published","published":"2022-05-17T05:37:18Z","modified":"2023-01-28T05:04:24Z","updated_at":"2026-11-02T14:44:09.964048Z"}],"nvd":[{"id":"CVE-2011-1756","description":"modules/xmpp/serv_xmpp.c in Citadel 7.86 and earlier does not properly detect recursion during entity expansion, which allows remote attackers to cause a denial of service (memory and CPU consumption) via a crafted XML document containing a large number of nested entity references, a similar issue to CVE-2003-1564.","status":"published","published":"2011-06-21T02:52:43.607Z","modified":"2026-06-16T23:29:58.023Z","cvss":[{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-399"],"updated_at":"2026-11-02T14:02:08.47516Z"}],"osv":[{"id":"DSA-2250-1","title":"citadel - denial of service","status":"published","published":"2011-05-31T00:00:00Z","modified":"2026-03-09T01:19:27.758137Z","updated_at":"2026-11-02T15:46:15.108335Z"},{"id":"UBUNTU-CVE-2011-1756","description":"modules/xmpp/serv_xmpp.c in Citadel 7.86 and earlier does not properly detect recursion during entity expansion, which allows remote attackers to cause a denial of service (memory and CPU consumption) via a crafted XML document containing a large number of nested entity references, a similar issue to CVE-2003-1564.","status":"withdrawn","published":"2011-06-21T02:52:00Z","modified":"2025-07-16T07:30:46.136382Z","updated_at":"2026-11-02T15:54:06.395274Z"}]}}