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Vulnerabilities

Vulnerability · CVE-2009-4355

CVE-2009-4355 is listed by inventory_critical.

Published Jan 14, 2010 · catalog updated Jun 16, 2026 · the affected product

Last checked Nov 7, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2009-4355. EPSS is 9.18%. Act only if a listed version of the affected product is installed.

Gaps on this record

  • No plain product name is stored. The page cannot tell you which product to check.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Medium5.0
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
9.18%
Remediation
Version ranges on file
Affected products
cpe openssl/openssl

CVE-2009-4355 is listed by inventory_critical.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe openssl/openssl0.9.1c
  • cpe openssl/openssl0.9.2b
  • cpe openssl/openssl0.9.3
  • cpe openssl/openssl0.9.3a
  • cpe openssl/openssl0.9.4
  • cpe openssl/openssl<= 0.9.8l

How to fix CVE-2009-4355

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2009-4355. EPSS is 9.18%. Act only if a listed version of the affected product is installed.

Which versions are affected?

Compare what you have installed with 0.9.1c, 0.9.2b, 0.9.3, 0.9.3a, 0.9.4, <= 0.9.8l. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-399. EPSS 9.18%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

OpenSSL security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jan 14, 2010 · Monitored products — critical

    Detected

    CVE-2009-4355 is listed by inventory_critical.

  2. Jun 16, 2026 · Monitored products — critical

    Updated

    CVE-2009-4355 is listed by inventory_critical.

Sources

  • CVE.orgVulnerability recordCVE-2009-4355

    Official CVE identifier

    cve.org
  • Monitored products — criticalVendor advisoryCVE-2009-4355

    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.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Nov 7, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • CVE.orgNov 4, 2026
  • Monitored products — criticalNov 4, 2026