CVE-2012-2333

CVE-2012-2333 is a medium-severity vulnerability in Redhat Openssl with a CVSS 2.0 base score of 6.8. Its EPSS exploit-prediction score of 28% places it in the 98th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-189.

Key facts

• Severity: Medium (CVSS 2.0 base score 6.8)
• EPSS exploit prediction: 28% (98th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-189
• Affected product: Redhat Openssl
• Published: 2012-05-14
• Last modified: 2026-06-16

Description

Integer underflow in OpenSSL before 0.9.8x, 1.0.0 before 1.0.0j, and 1.0.1 before 1.0.1c, when TLS 1.1, TLS 1.2, or DTLS is used with CBC encryption, allows remote attackers to cause a denial of service (buffer over-read) or possibly have unspecified other impact via a crafted TLS packet that is not properly handled during a certain explicit IV calculation.

Frequently asked questions

What is CVE-2012-2333?

Integer underflow in OpenSSL before 0.9.8x, 1.0.0 before 1.0.0j, and 1.0.1 before 1.0.1c, when TLS 1.1, TLS 1.2, or DTLS is used with CBC encryption, allows remote attackers to cause a denial of service (buffer over-read) or possibly have unspecified other impact via a crafted TLS packet that is not properly handled during a certain explicit IV calculation.

How severe is CVE-2012-2333?

CVE-2012-2333 has a CVSS 2.0 base score of 6.8, rated medium severity.

Is CVE-2012-2333 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 28% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2012-2333?

CVE-2012-2333 primarily affects Redhat Openssl. In total, 99 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2012-2333?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2012-2333 published?

CVE-2012-2333 was published on 2012-05-14 and last updated on 2026-06-16.

References

• http://cvs.openssl.org/chngview?cn=22538
• http://cvs.openssl.org/chngview?cn=22547
• http://lists.apple.com/archives/security-announce/2013/Jun/msg00000.html
• http://lists.fedoraproject.org/pipermail/package-announce/2012-May/081460.html
• http://lists.fedoraproject.org/pipermail/package-announce/2012-November/092905.html
• http://lists.opensuse.org/opensuse-security-announce/2012-05/msg00019.html
• http://lists.opensuse.org/opensuse-security-announce/2012-05/msg00020.html
• http://marc.info/?l=bugtraq&m=134919053717161&w=2
• http://marc.info/?l=bugtraq&m=136432043316835&w=2
• http://rhn.redhat.com/errata/RHSA-2012-0699.html
• http://rhn.redhat.com/errata/RHSA-2012-1306.html
• http://rhn.redhat.com/errata/RHSA-2012-1307.html
• http://rhn.redhat.com/errata/RHSA-2012-1308.html
• http://secunia.com/advisories/49116
• http://secunia.com/advisories/49208
• http://secunia.com/advisories/49324
• http://secunia.com/advisories/50768
• http://secunia.com/advisories/51312
• http://support.apple.com/kb/HT5784
• http://www.cert.fi/en/reports/2012/vulnerability641549.html
• http://www.debian.org/security/2012/dsa-2475
• http://www.kb.cert.org/vuls/id/737740
• http://www.mandriva.com/security/advisories?name=MDVSA-2012:073
• http://www.openssl.org/news/secadv_20120510.txt
• http://www.securityfocus.com/bid/53476
• http://www.securitytracker.com/id?1027057
• https://bugzilla.redhat.com/show_bug.cgi?id=820686
• https://exchange.xforce.ibmcloud.com/vulnerabilities/75525

Affected products (99)

• cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.1c:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.2b:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.3:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.3a:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.4:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.5:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.5:beta1:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.5:beta2:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.5a:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.5a:beta1:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.5a:beta2:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.6:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.6:beta1:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.6:beta2:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.6:beta3:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.6a:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.6a:beta1:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.6a:beta2:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.6a:beta3:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.6b:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.6c:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.6d:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.6e:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.6f:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.6g:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.6h:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.6i:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.6j:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.6k:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.6l:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.6m:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.7:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.7:beta1:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.7:beta2:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.7:beta3:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.7:beta4:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.7:beta5:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.7:beta6:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.7a:*:*:*:*:*:*:*

More vulnerabilities in Redhat Openssl

• CVE-2012-2110 — High (CVSS 7.5): The asn1_d2i_read_bio function in crypto/asn1/a_d2i_fp.c in OpenSSL before 0.9.8v, 1.0.0 before 1.0.0i, and 1.0.1…
• CVE-2004-0079 — High (CVSS 7.5): The do_change_cipher_spec function in OpenSSL 0.9.6c to 0.9.6k, and 0.9.7a to 0.9.7c, allows remote attackers to cause…
• CVE-2013-0166 — Medium (CVSS 5.0): OpenSSL before 0.9.8y, 1.0.0 before 1.0.0k, and 1.0.1 before 1.0.1d does not properly perform signature verification…
• CVE-2009-4355 — Medium (CVSS 5.0): Memory leak in the zlib_stateful_finish function in crypto/comp/c_zlib.c in OpenSSL 0.9.8l and earlier and 1.0.0 Beta…
• CVE-2009-1387 — Medium (CVSS 5.0): The dtls1_retrieve_buffered_fragment function in ssl/d1_both.c in OpenSSL before 1.0.0 Beta 2 allows remote attackers…
• CVE-2009-1386 — Medium (CVSS 5.0): ssl/s3_pkt.c in OpenSSL before 0.9.8i allows remote attackers to cause a denial of service (NULL pointer dereference…

All CVEs affecting Redhat Openssl →

Other CWE-189 (Numeric Errors) vulnerabilities

• CVE-2015-8396 — Critical (CVSS 10.0): Integer overflow in the ImageRegionReader::ReadIntoBuffer function in…
• CVE-2015-7205 — Critical (CVSS 10.0): Integer underflow in the RTPReceiverVideo::ParseRtpPacket function in Mozilla Firefox before 43.0 and Firefox ESR 38.x…
• CVE-2015-6575 — Critical (CVSS 10.0): SampleTable.cpp in libstagefright in Android before 5.1.1 LMY48I does not properly consider integer promotion, which…
• CVE-2015-3864 — Critical (CVSS 10.0): Integer underflow in the MPEG4Extractor::parseChunk function in MPEG4Extractor.cpp in libstagefright in mediaserver in…
• CVE-2015-3836 — Critical (CVSS 10.0): The Parse_wave function in arm-wt-22k/lib_src/eas_mdls.c in the Sonivox DLS-to-EAS converter in Android before 5.1.1…
• CVE-2015-3834 — Critical (CVSS 10.0): Multiple integer overflows in the BnHDCP::onTransact function in media/libmedia/IHDCP.cpp in libstagefright in Android…

Browse all CWE-189 (Numeric Errors) vulnerabilities →

Threat intelligence

Threat-intel indicators referencing this CVE:

• 222.99.52.202 (ipv4-addr)
• 121.164.135.251 (ipv4-addr)
• 90.160.135.217 (ipv4-addr)
• 62.36.19.42 (ipv4-addr)
• 62.36.19.41 (ipv4-addr)
• 171.100.156.38 (ipv4-addr)