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    CVE-2011-1521

    The urllib and urllib2 modules in Python 2.x before 2.7.2 and 3.x before 3.2.1 process Location headers that specify redirection to file: URLs, which makes it easier for remote attackers to obtain sensitive information or cause a denial of service (resource consumption) via a crafted URL, as demonstrated by the file:///etc/passwd and file:///dev/zero URLs.

    Published:Mar 24, 2011
    Last Modified:Apr 11, 2025
    EPS:May 24, 2011
    EPSS Score:0.02608
    CVSS Score:6.4

    Affected Products

    Vendor
    Python
    Product
    Python
    Vendor
    Redhat
    Product
    Enterprise Linux

    Exploits

    No exploit reference

    Common Weakness Enumeration

    No CWE recorded yet

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    CVE-2026-7210 (CVSS 6.3) — `xml.parsers.expat` and `xml.etree.ElementTree` use insufficient entropy for Expat hash-flooding protection, w…
    CVE-2026-3087 (CVSS 6) — If `shutil.unpack_archive()` is given a ZIP archive with an absolute Windows path containing a drive (`C:\\...…
    CVE-2026-6019 (CVSS 2.1) — http.cookies.Morsel.js_output() returns an inline <script> snippet and only escapes " for JavaScript string co…
    CVE-2026-4519 (CVSS 7) — The webbrowser.open() API would accept leading dashes in the URL which could be handled as command line optio…
    CVE-2026-4224 (CVSS 6) — When an Expat parser with a registered ElementDeclHandler parses an inline document type definition containing…
    CVE-2026-3644 (CVSS 6) — The fix for CVE-2026-0672, which rejected control characters in http.cookies.Morsel, was incomplete. The Morse…
    CVE-2025-13462 (CVSS 2) — The "tarfile" module would still apply normalization of AREGTYPE (\x00) blocks to DIRTYPE, even while processi…
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    References

    http://bugs.python.org/issue11662
    http://hg.python.org/cpython/file/96a6c128822b/Misc/NEWS
    http://hg.python.org/cpython/file/b2934d98dac1/Misc/NEWS
    http://hg.python.org/cpython/rev/96a6c128822b/
    http://hg.python.org/cpython/rev/b2934d98dac1/
    http://lists.apple.com/archives/Security-announce/2011//Oct/msg00003.html
    http://lists.opensuse.org/opensuse-security-announce/2011-05/msg00005.html
    http://openwall.com/lists/oss-security/2011/03/24/5
    http://openwall.com/lists/oss-security/2011/03/28/2
    http://openwall.com/lists/oss-security/2011/09/11/1
    http://openwall.com/lists/oss-security/2011/09/13/2
    http://openwall.com/lists/oss-security/2011/09/15/5
    http://secunia.com/advisories/50858
    http://secunia.com/advisories/51024
    http://secunia.com/advisories/51040
    http://securitytracker.com/id?1025488
    http://support.apple.com/kb/HT5002
    http://www.mandriva.com/security/advisories?name=MDVSA-2011:096
    http://www.ubuntu.com/usn/USN-1592-1
    http://www.ubuntu.com/usn/USN-1596-1
    http://www.ubuntu.com/usn/USN-1613-1
    http://www.ubuntu.com/usn/USN-1613-2
    https://bugzilla.redhat.com/show_bug.cgi?id=690560
    https://bugzilla.redhat.com/show_bug.cgi?id=737366
    https://www.djangoproject.com/weblog/2011/sep/09/
    https://www.djangoproject.com/weblog/2011/sep/10/127/
    http://bugs.python.org/issue11662
    http://hg.python.org/cpython/file/96a6c128822b/Misc/NEWS
    http://hg.python.org/cpython/file/b2934d98dac1/Misc/NEWS
    http://hg.python.org/cpython/rev/96a6c128822b/
    http://hg.python.org/cpython/rev/b2934d98dac1/
    http://lists.apple.com/archives/Security-announce/2011//Oct/msg00003.html
    http://lists.opensuse.org/opensuse-security-announce/2011-05/msg00005.html
    http://openwall.com/lists/oss-security/2011/03/24/5
    http://openwall.com/lists/oss-security/2011/03/28/2
    http://openwall.com/lists/oss-security/2011/09/11/1
    http://openwall.com/lists/oss-security/2011/09/13/2
    http://openwall.com/lists/oss-security/2011/09/15/5
    http://secunia.com/advisories/50858
    http://secunia.com/advisories/51024
    http://secunia.com/advisories/51040
    http://securitytracker.com/id?1025488
    http://support.apple.com/kb/HT5002
    http://www.mandriva.com/security/advisories?name=MDVSA-2011:096
    http://www.ubuntu.com/usn/USN-1592-1
    http://www.ubuntu.com/usn/USN-1596-1
    http://www.ubuntu.com/usn/USN-1613-1
    http://www.ubuntu.com/usn/USN-1613-2
    https://bugzilla.redhat.com/show_bug.cgi?id=690560
    https://bugzilla.redhat.com/show_bug.cgi?id=737366
    https://www.djangoproject.com/weblog/2011/sep/09/
    https://www.djangoproject.com/weblog/2011/sep/10/127/

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High