What is CVE-2012-5134?

CVE-2012-5134 is a vulnerability in Apple Iphone OS, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. Published 2012-11-28.

Is CVE-2012-5134 known to be exploited?

3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Apple Iphone OS

CVE-2012-5134

Heap-based buffer underflow in the xmlParseAttValueComplex function in parser.c in libxml2 2.9.0 and earlier, as used in Google Chrome before 23.0.1271.91 and other products, allows remote attackers to cause a denial of service or possibly execute arbitrary code via crafted entities in an XML document.

Vulnerability class: Buffer Overflow

Published 2012-11-28 · last modified 2026-06-16.

CVSS v2 metric

CVSS v2 base score 6.8 (Medium). Vector: AV:N/AC:M/Au:N/C:P/I:P/A:P. This CVE predates CVSS v3 and has no v3 score from NVD.

EPSS exploit prediction

EPSS: 0.044 (91.0th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 91st percentile — 91.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.044 · newest: 0.044 · change: 0.000

Affected products

Apple Iphone OS — versions 1.0.0, 1.0.1, 1.0.2
Google Chrome — versions 23.0.1271.0, 23.0.1271.1, 23.0.1271.2
Xmlsoft Libxml2 — versions 1.7.0, 1.7.1, 1.7.2

Weakness classification (CWE)

CWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer

Public proof-of-concept exploits

References

bugzilla.redhat.com/show_bug.cgi
lists.apple.com/archives/security-announce/2013/Oct/msg00009.html (vendor-advisory)
lists.opensuse.org/opensuse-security-announce/2013-11/msg00002.html (vendor-advisory)
lists.opensuse.org/opensuse-security-announce/2012-12/msg00004.html (vendor-advisory)
googlechromereleases.blogspot.com/2012/11/stable-channel-update.html
rhn.redhat.com/errata/RHSA-2013-0217.html (vendor-advisory)
www.ubuntu.com/usn/USN-1656-1 (vendor-advisory)
www.debian.org/security/2012/dsa-2580 (vendor-advisory)
support.apple.com/kb/HT6001
exchange.xforce.ibmcloud.com/vulnerabilities/80294 (vdb-entry)

Frequently asked questions

What is CVE-2012-5134?: CVE-2012-5134 is a vulnerability in Apple Iphone OS, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. Published 2012-11-28.
Is CVE-2012-5134 known to be exploited?: 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.