CVE-2011-1344
Description
Use-after-free vulnerability in WebKit, as used in Apple Safari before 5.0.5; iOS before 4.3.2 for iPhone, iPod, and iPad; iOS before 4.2.7 for iPhone 4 (CDMA); and possibly other products allows remote attackers to execute arbitrary code by adding children to a WBR tag and then removing the tag, related to text nodes, as demonstrated by Chaouki Bekrar during a Pwn2Own competition at CanSecWest 2011.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
WebKit use-after-free in WBR tag handling allows remote code execution via a crafted webpage.
Vulnerability
A use-after-free vulnerability exists in WebKit’s handling of WBR (word break opportunity) HTML elements. The issue occurs when a script dynamically adds child nodes to a WBR tag and then removes the tag (e.g., via a removeChild call), leaving a dangling pointer to freed memory. This affects Apple Safari before 5.0.5, iOS before 4.3.2 (iPhone, iPod, iPad), iOS before 4.2.7 (iPhone 4 CDMA), and other products embedding WebKit [1][4].
Exploitation
An attacker must craft a malicious webpage that includes JavaScript to add children to a WBR element and subsequently remove it. The target user must visit this page using an affected browser or application. No additional authentication or network position is required; the entire attack occurs client-side [4].
Impact
Successful exploitation results in arbitrary code execution within the security context of the current user. This can lead to full compromise of the affected device or browser, including data theft and further system access. The CVSS score is 9.0 (AV:N/AC:L/Au:N/C:P/I:P/A:C) [4].
Mitigation
Apple released fixes in iOS 4.2.7 for iPhone 4 (CDMA) on March 11, 2011, and in Safari 5.0.5 and iOS 4.3.2 shortly afterward [1]. Users should update to the latest available versions. No workaround exists aside from applying the vendor patches.
AI Insight generated on May 23, 2026. Synthesized from this CVE's description and the cited reference URLs; citations are validated against the source bundle.
Affected products
110cpe:2.3:a:apple:safari:*:*:*:*:*:*:*:*+ 72 more
- cpe:2.3:a:apple:safari:*:*:*:*:*:*:*:*range: <=5.0.4
- cpe:2.3:a:apple:safari:1.0:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:1.0.0:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:1.0.0b1:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:1.0.0b2:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:1.0.1:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:1.0.2:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:1.0.3:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:1.0.3:85.8:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:1.0.3:85.8.1:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:1.0:beta:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:1.0:beta2:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:1.1:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:1.1.0:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:1.1.1:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:1.2:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:1.2.0:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:1.2.1:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:1.2.2:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:1.2.3:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:1.2.4:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:1.2.5:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:1.3:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:1.3.0:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:1.3.1:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:1.3.2:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:1.3.2:312.5:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:1.3.2:312.6:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:2:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:2.0:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:2.0.0:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:2.0.1:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:2.0.2:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:2.0.3:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:2.0.3:417.8:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:2.0.3:417.9:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:2.0.3:417.9.2:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:2.0.3:417.9.3:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:2.0.4:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:3:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:3.0:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:3.0.0:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:3.0.0b:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:3.0.1:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:3.0.1b:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:3.0.2:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:3.0.2b:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:3.0.3:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:3.0.3b:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:3.0.4:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:3.0.4b:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:3.1.0:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:3.1.0b:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:3.1.1:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:3.1.2:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:3.2.0:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:3.2.1:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:3.2.2:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:4.0:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:4.0.0b:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:4.0.1:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:4.0.2:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:4.0.3:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:4.0.4:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:4.0.5:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:4.0:beta:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:4.1:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:4.1.1:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:4.1.2:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:5.0:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:5.0.1:*:*:*:*:*:*:*
- cpe:2.3:a:apple:safari:5.0.2:*:*:*:*:*:*:*
- (no CPE)range: <5.0.5
cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*+ 34 more
- cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*range: <=4.3.1
- cpe:2.3:o:apple:iphone_os:1.0.0:*:*:*:*:*:*:*
- cpe:2.3:o:apple:iphone_os:1.0.1:*:*:*:*:*:*:*
- cpe:2.3:o:apple:iphone_os:1.0.2:*:*:*:*:*:*:*
- cpe:2.3:o:apple:iphone_os:1.1.0:*:*:*:*:*:*:*
- cpe:2.3:o:apple:iphone_os:1.1.1:*:*:*:*:*:*:*
- cpe:2.3:o:apple:iphone_os:1.1.2:*:*:*:*:*:*:*
- cpe:2.3:o:apple:iphone_os:1.1.3:*:*:*:*:*:*:*
- cpe:2.3:o:apple:iphone_os:1.1.4:*:*:*:*:*:*:*
- cpe:2.3:o:apple:iphone_os:1.1.5:*:*:*:*:*:*:*
- cpe:2.3:o:apple:iphone_os:2.0:*:*:*:*:*:*:*
- cpe:2.3:o:apple:iphone_os:2.0.0:*:*:*:*:*:*:*
- cpe:2.3:o:apple:iphone_os:2.0.1:*:*:*:*:*:*:*
- cpe:2.3:o:apple:iphone_os:2.0.2:*:*:*:*:*:*:*
- cpe:2.3:o:apple:iphone_os:2.1:*:*:*:*:*:*:*
- cpe:2.3:o:apple:iphone_os:2.1.1:*:*:*:*:*:*:*
- cpe:2.3:o:apple:iphone_os:2.2:*:*:*:*:*:*:*
- cpe:2.3:o:apple:iphone_os:2.2.1:*:*:*:*:*:*:*
- cpe:2.3:o:apple:iphone_os:3.0:*:*:*:*:*:*:*
- cpe:2.3:o:apple:iphone_os:3.0.1:*:*:*:*:*:*:*
- cpe:2.3:o:apple:iphone_os:3.1:*:*:*:*:*:*:*
- cpe:2.3:o:apple:iphone_os:3.1.2:*:*:*:*:*:*:*
- cpe:2.3:o:apple:iphone_os:3.1.3:*:*:*:*:*:*:*
- cpe:2.3:o:apple:iphone_os:3.2:*:*:*:*:*:*:*
- cpe:2.3:o:apple:iphone_os:3.2.1:*:*:*:*:*:*:*
- cpe:2.3:o:apple:iphone_os:3.2.2:*:*:*:*:*:*:*
- cpe:2.3:o:apple:iphone_os:4.0:*:*:*:*:*:*:*
- cpe:2.3:o:apple:iphone_os:4.0.1:*:*:*:*:*:*:*
- cpe:2.3:o:apple:iphone_os:4.0.2:*:*:*:*:*:*:*
- cpe:2.3:o:apple:iphone_os:4.1:*:*:*:*:*:*:*
- cpe:2.3:o:apple:iphone_os:4.2:*:*:*:*:*:*:*
- cpe:2.3:o:apple:iphone_os:4.2.1:*:*:*:*:*:*:*
- cpe:2.3:o:apple:iphone_os:4.2.5:*:*:*:*:*:*:*
- cpe:2.3:o:apple:iphone_os:4.2.8:*:*:*:*:*:*:*
- cpe:2.3:o:apple:iphone_os:4.3.0:*:*:*:*:*:*:*
- Range: <4.2.7
- Range: <4.3.2
Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
18- dvlabs.tippingpoint.com/blog/2011/02/02/pwn2own-2011nvd
- lists.apple.com/archives/security-announce/2011//Apr/msg00000.htmlnvd
- lists.apple.com/archives/security-announce/2011//Apr/msg00001.htmlnvd
- lists.apple.com/archives/security-announce/2011//Apr/msg00002.htmlnvd
- secunia.com/advisories/44151nvd
- secunia.com/advisories/44154nvd
- support.apple.com/kb/HT4596nvd
- support.apple.com/kb/HT4607nvd
- twitter.com/aaronportnoy/statuses/45632544967901187nvd
- www.computerworld.com/s/article/9214002/Safari_IE_hacked_first_at_Pwn2Ownnvd
- www.securityfocus.com/archive/1/517505/100/0/threadednvd
- www.securityfocus.com/archive/1/517517/100/0/threadednvd
- www.securityfocus.com/bid/46822nvd
- www.securitytracker.com/idnvd
- www.vupen.com/english/advisories/2011/0984nvd
- www.zdnet.com/blog/security/safarimacbook-first-to-fall-at-pwn2own-2011/8358nvd
- www.zerodayinitiative.com/advisories/ZDI-11-135nvd
- exchange.xforce.ibmcloud.com/vulnerabilities/66061nvd
News mentions
0No linked articles in our index yet.