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Fencer Intel
high 7.5

CVE-2012-3423 json

The IcedTea-Web plugin before 1.2.1 does not properly handle NPVariant NPStrings without NUL terminators, which allows remote attackers to…

published 2012-08-07 14 y ago modified 2026-06-16 4 mo ago also EUVD-2012-3393

cvss
7.5
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
6.2%
EPSS 6.2% chance of exploitation in 30 days, percentile 93%
public exploits
0
none known

Summary

The IcedTea-Web plugin before 1.2.1 does not properly handle NPVariant NPStrings without NUL terminators, which allows remote attackers to cause a denial of service (crash), obtain sensitive information from memory, or execute arbitrary code via a crafted Java applet.

Patch / fix

  • icedtea-web Debian 14, Debian 13, Debian 12 1.3-1

debian advisories DEBIAN-CVE-2012-3423

  • icedtea-web RHEL 6 1.2.1-1.el6_3
  • icedtea-web-javadoc RHEL 6 1.2.1-1.el6_3

red hat advisories RHSA-2012:1132

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2012-3423 updated cvss 5.1

icedtea-web: incorrect handling of not 0-terminated strings

  • Red Hat Enterprise Linux Desktop (v. 6) icedtea-web 1.2.1-1.el6_3, icedtea-web-javadoc 1.2.1-1.el6_3 Red Hat Enterprise Linux Desktop Optional (v. 6) icedtea-web 1.2.1-1.el6_3, icedtea-web-javadoc 1.2.1-1.el6_3 Red Hat Enterprise Linux HPC Node (v. 6) icedtea-web 1.2.1-1.el6_3, icedtea-web-javadoc 1.2.1-1.el6_3 Red Hat Enterprise Linux HPC Node Optional (v. 6) icedtea-web 1.2.1-1.el6_3, icedtea-web-javadoc 1.2.1-1.el6_3 Red Hat Enterprise Linux Server (v. 6) icedtea-web 1.2.1-1.el6_3, icedtea-web-javadoc 1.2.1-1.el6_3 Red Hat Enterprise Linux Server Optional (v. 6) icedtea-web 1.2.1-1.el6_3, icedtea-web-javadoc 1.2.1-1.el6_3
    +2 more products
    Red Hat Enterprise Linux Workstation (v. 6) icedtea-web 1.2.1-1.el6_3, icedtea-web-javadoc 1.2.1-1.el6_3 Red Hat Enterprise Linux Workstation Optional (v. 6) icedtea-web 1.2.1-1.el6_3, icedtea-web-javadoc 1.2.1-1.el6_3
    fixed: vendor fix RHSA-2012:1132

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

6.17% chance of exploitation in the next 30 days, higher than 93% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • icedtea.classpath.org http://icedtea.classpath.org/hg/release/icedtea-web-1.2/rev/d65bd94e0ba9 referenced PoC, tagged "exploit" by a source, unverified
  • icedtea.classpath.org http://icedtea.classpath.org/hg/release/icedtea-web-1.2/rev/d7375e2a9076 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

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

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.