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CVE-2010-3870

38
FAUCET Score

CVE-2010-3870 describes a vulnerability in the utf8_decode function of PHP versions prior to 5.3.4, affecting products like Canonical PHP and Ubuntu Linux. This flaw allows remote attackers to bypass XSS and SQL injection protections by exploiting improper handling of non-shortest form UTF-8 encoding and malformed subsequences. With a CVSS score of 6.8, this vulnerability has a network attack vector, medium attack complexity, and potential for partial confidentiality, integrity, and availability impacts. While there is no evidence of active exploitation in the wild or Metasploit/Nuclei modules, an ExploitDB entry (EDB-34950) exists, and community discussion and media coverage are minimal.

Impacted Technologies

VendorProductVersion(s)CPE
< 5.2.14CPE matchmatch criteria
cpe:2.3:a:php:php:*:*:*:*:*:*:*:*
>= 5.3.0, < 5.3.4CPE matchmatch criteria
cpe:2.3:a:php:php:*:*:*:*:*:*:*:*
6.06CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:6.06:*:*:*:*:*:*:*
8.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:8.04:*:*:*:-:*:*:*
9.10CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:9.10:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

6.8MEDIUM

AV:N/AC:M/Au:N/C:P/I:P/A:P

Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Exploitability Score
8.6
Impact Score
6.4
CvssVersion
2.0

Exploit Intelligence

EPSS Score
11.28%
Probability of exploitation in next 30 days
EPSS Percentile
95.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
ExploitDB: EDB-34950 · May 11, 2009
This CVE's current EPSS score of 0.1128 is in the 95th percentile among its peer group of 19,958 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (4)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 4Fixed in: php-0:4.3.9-3.31
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: php-0:5.1.6-27.el5_5.3
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: php-0:5.3.2-6.el6_0.1
View patch
redhatno patchvia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: php53

Vendor Advisories (1)

redhatCVE-2010-3870Moderate

php: XSS mitigation bypass via utf8_decode()

Sep 27, 2009

References

bugs.php.net / bug.php
ExploitVendor Advisory
bugs.php.net / bug.php
ExploitVendor Advisory
lists.apple.com / archives/security-announce/2011/Mar/msg00006.html
Mailing ListThird Party Advisory
lists.fedoraproject.org / pipermail/package-announce/2011-January/052836.html
Mailing ListThird Party Advisory
lists.fedoraproject.org / pipermail/package-announce/2011-January/052845.html
Mailing ListThird Party Advisory
lists.opensuse.org / opensuse-security-announce/2010-12/msg00000.html
Mailing ListThird Party Advisory
marc.info
Mailing ListThird Party Advisory
secunia.com / advisories/42410
Third Party Advisory
secunia.com / advisories/42812
Third Party Advisory
sirdarckcat.blogspot.com / 2009/10/couple-of-unicode-issues-on-php-and.html
ExploitThird Party Advisory
support.apple.com / kb/HT4581
Third Party Advisory
svn.php.net / viewvc
PatchVendor Advisory
us2.php.net / manual/en/function.utf8-decode.php
ExploitVendor Advisory
acunetix.com / blog/web-security-articles/security-risks-associated-with-utf8_decode
ExploitThird Party Advisory
blackhat.com / presentations/bh-usa-09/VELANAVA/BHUSA09-VelaNava-FavoriteXSS-SLIDES.pdf
ExploitThird Party Advisory
mandriva.com / en/security/advisories
Third Party Advisory
openwall.com / lists/oss-security/2010/11/02/1
Mailing ListThird Party Advisory
openwall.com / lists/oss-security/2010/11/02/11
Mailing ListThird Party Advisory
openwall.com / lists/oss-security/2010/11/02/2
Mailing ListThird Party Advisory
openwall.com / lists/oss-security/2010/11/02/4
Mailing ListThird Party Advisory
openwall.com / lists/oss-security/2010/11/02/6
Mailing ListThird Party Advisory
openwall.com / lists/oss-security/2010/11/02/8
Mailing ListThird Party Advisory
openwall.com / lists/oss-security/2010/11/03/1
Mailing ListThird Party Advisory
php.net / ChangeLog-5.php
Vendor Advisory
redhat.com / support/errata/RHSA-2010-0919.html
Third Party Advisory
redhat.com / support/errata/RHSA-2011-0195.html
Third Party Advisory
securityfocus.com / bid/44605
Third Party AdvisoryVDB Entry
securitytracker.com / id
Third Party AdvisoryVDB Entry
ubuntu.com / usn/USN-1042-1
Third Party Advisory
vupen.com / english/advisories/2010/3081
Third Party Advisory
vupen.com / english/advisories/2011/0020
Third Party Advisory
vupen.com / english/advisories/2011/0021
Third Party Advisory
vupen.com / english/advisories/2011/0077
Third Party Advisory