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Fencer Intel
medium 5.0

CVE-2009-4355 json

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…

published 16y ago modified 4mo ago also EUVD-2009-4323

cvss
5.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
9.2%
EPSS 9.2% chance of exploitation in 30 days, percentile 95%
public exploits
0
none known

Summary

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.

Patch / fix

  • openssl Debian 14, Debian 13, Debian 12 0.9.8k-8

debian advisories DEBIAN-CVE-2009-4355

  • openssl RHEL 5 0.9.8e-12.el5_4.1
  • openssl-perl RHEL 5 0.9.8e-12.el5_4.1

red hat advisories RHSA-2010:0054

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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-2009-4355 updated cvss 4.3

openssl significant memory leak in certain SSLv3 requests (DoS)

  • Red Hat Enterprise Linux (v. 5 server) openssl 0.9.8e-12.el5_4.1, openssl-perl 0.9.8e-12.el5_4.1 Red Hat Enterprise Linux Desktop (v. 5 client) openssl 0.9.8e-12.el5_4.1, openssl-perl 0.9.8e-12.el5_4.1 Red Hat Enterprise Linux Desktop Workstation (v. 5 client) openssl 0.9.8e-12.el5_4.1, openssl-perl 0.9.8e-12.el5_4.1
    fixed: vendor fix RHSA-2010:0054

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

9.18% chance of exploitation in the next 30 days, higher than 95% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness
  • CWE-399 Resource Management Errors
Technology feeds

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.