Medium 5.0Published Jan 14, 2010

CVE-2009-4355Memory 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 through Beta 4 allows remote attackers to cause a denial of service (memory consu…

Updated under an hour ago (Nov 2, 2026, 12:10 AM ET)

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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 through Beta 4 allows remote attackers to cause a denial of service (memory consumption) via vectors that trigger incorrect calls to the CRYPTO_cleanup_all_ex_data function, as demonstrated by use of SSLv3 and PHP with the Apache HTTP Server, a related issue to CVE-2008-1678.

CVSS: 5.0 MEDIUM (v2.0, NVD)AV:N/AC:L/Au:N/C:N/I:N/A:P
Weakness (CWE): CWE-399
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Modified
Record last updated: Jun 16, 2026
First seen by InfoSec Signals: Nov 1, 2026

Affected products

Affected products

openssl openssl openssl:openssl	through 0.9.8l; 0.9.1c; 0.9.2b; 0.9.3; 0.9.3a; 0.9.4; 0.9.5; 0.9.5; and 60 more ranges	NVD
redhat openssl redhat:openssl	0.9.6-15; 0.9.6b-3; 0.9.7a-2	NVD

References

References

http://cvs.openssl.org/chngview?cn=19068
http://cvs.openssl.org/chngview?cn=19069
http://cvs.openssl.org/chngview?cn=19167
http://lists.fedoraproject.org/pipermail/package-announce/2010-April/038587.html
http://lists.fedoraproject.org/pipermail/package-announce/2010-April/039561.html
http://lists.opensuse.org/opensuse-security-announce/2010-01/msg00009.html
http://marc.info/?l=bugtraq&m=127128920008563&w=2
http://secunia.com/advisories/38175	vendor-advisory
http://secunia.com/advisories/38181	vendor-advisory
http://secunia.com/advisories/38200	vendor-advisory
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.