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Fencer Vulns
medium 6.8

CVE-2007-4770 json

libicu in International Components for Unicode (ICU) 3.8.1 and earlier attempts to process backreferences to the nonexistent capture group…

published 2008-01-28 18 y ago modified 2026-06-16 4 mo ago also EUVD-2007-4751

cvss
6.8
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.9%
EPSS 2.9% chance of exploitation in 30 days, percentile 87%
public exploits
0
none known

Summary

libicu in International Components for Unicode (ICU) 3.8.1 and earlier attempts to process backreferences to the nonexistent capture group zero (aka \0), which might allow context-dependent attackers to read from, or write to, out-of-bounds memory locations, related to corruption of REStackFrames.

Patch / fix

  • icu Debian 14, Debian 13, Debian 12 3.8-6

debian advisories DEBIAN-CVE-2007-4770

  • icu RHEL 5 3.6-5.11.1
  • libicu RHEL 5 3.6-5.11.1

red hat advisories RHSA-2008:0090

  • icu openSUSE Tumbleweed 69.1-2.3

opensuse advisories openSUSE-SU-2024:10859-1

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-2007-4770 updated

libicu poor back reference validation

  • Red Hat Enterprise Linux (v. 5 server) icu 3.6-5.11.1, libicu 3.6-5.11.1 Red Hat Enterprise Linux Desktop (v. 5 client) icu 3.6-5.11.1, libicu 3.6-5.11.1 Red Hat Enterprise Linux Desktop Workstation (v. 5 client) icu 3.6-5.11.1, libicu 3.6-5.11.1
    fixed: vendor fix RHSA-2008:0090

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

2.93% chance of exploitation in the next 30 days, higher than 87% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-399 Resource Management Errors

References

Sources

Fencer Vulns 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.