How severe is CVE-2011-1209?

CVE-2011-1209 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2011-1209 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-1209?

CVE-2011-1209 primarily affects Ibm Websphere Application Server. In total, 46 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-1209?

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

When was CVE-2011-1209 published?

CVE-2011-1209 was published on 2011-05-04 and last updated on 2026-06-16.

CVE-2011-1209

CVE-2011-1209 is a medium-severity vulnerability in Ibm Websphere Application Server with a CVSS 2.0 base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-310.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 1% (48th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-310
Affected product: Ibm Websphere Application Server
Published: 2011-05-04
Last modified: 2026-06-16

Description

IBM WebSphere Application Server (WAS) 6.1 before 6.1.0.39 and 7.0 before 7.0.0.17 uses a weak WS-Security XML encryption algorithm, which makes it easier for remote attackers to obtain plaintext data from a (1) JAX-RPC or (2) JAX-WS Web Services request via unspecified vectors related to a "decryption attack."

Frequently asked questions

What is CVE-2011-1209?: IBM WebSphere Application Server (WAS) 6.1 before 6.1.0.39 and 7.0 before 7.0.0.17 uses a weak WS-Security XML encryption algorithm, which makes it easier for remote attackers to obtain plaintext data from a (1) JAX-RPC or (2) JAX-WS Web Services request via unspecified vectors related to a "decryption attack."
How severe is CVE-2011-1209?: CVE-2011-1209 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2011-1209 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-1209?: CVE-2011-1209 primarily affects Ibm Websphere Application Server. In total, 46 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-1209?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2011-1209 published?: CVE-2011-1209 was published on 2011-05-04 and last updated on 2026-06-16.

References

Affected products (46)

cpe:2.3:a:ibm:websphere_application_server:6.1.0:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server:6.1.0.0:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server:6.1.0.1:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server:6.1.0.2:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server:6.1.0.3:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server:6.1.0.5:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server:6.1.0.7:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server:6.1.0.9:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server:6.1.0.11:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server:6.1.0.12:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server:6.1.0.15:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server:6.1.0.17:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server:6.1.0.19:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server:6.1.0.21:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server:6.1.0.22:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server:6.1.0.23:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server:6.1.0.24:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server:6.1.0.25:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server:6.1.0.27:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server:6.1.0.29:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server:6.1.0.31:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server:6.1.0.32:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server:6.1.0.33:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server:6.1.0.35:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server:6.1.0.37:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server:6.1.1:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server:6.1.3:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server:6.1.5:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server:6.1.6:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server:6.1.7:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server:6.1.13:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server:6.1.14:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server:7.0.0.1:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server:7.0.0.2:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server:7.0.0.3:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server:7.0.0.4:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server:7.0.0.5:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server:7.0.0.6:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server:7.0.0.7:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server:7.0.0.8:*:*:*:*:*:*:*

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