How severe is CVE-2009-0050?

CVE-2009-0050 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2009-0050 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-0050?

CVE-2009-0050 primarily affects Entrouvert Lasso. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-0050?

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

When was CVE-2009-0050 published?

CVE-2009-0050 was published on 2009-01-07 and last updated on 2026-06-16.

CVE-2009-0050

CVE-2009-0050 is a medium-severity vulnerability in Entrouvert Lasso 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-20.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 1% (68th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Entrouvert Lasso
Published: 2009-01-07
Last modified: 2026-06-16

Description

Lasso 2.2.1 and earlier does not properly check the return value from the OpenSSL DSA_verify function, which allows remote attackers to bypass validation of the certificate chain via a malformed SSL/TLS signature, a similar vulnerability to CVE-2008-5077.

Frequently asked questions

What is CVE-2009-0050?: Lasso 2.2.1 and earlier does not properly check the return value from the OpenSSL DSA_verify function, which allows remote attackers to bypass validation of the certificate chain via a malformed SSL/TLS signature, a similar vulnerability to CVE-2008-5077.
How severe is CVE-2009-0050?: CVE-2009-0050 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2009-0050 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-0050?: CVE-2009-0050 primarily affects Entrouvert Lasso. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-0050?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2009-0050 published?: CVE-2009-0050 was published on 2009-01-07 and last updated on 2026-06-16.

References

Affected products (3)

cpe:2.3:a:entrouvert:lasso:*:*:*:*:*:*:*:*
cpe:2.3:a:entrouvert:lasso:1.9.9.0:*:*:*:*:*:*:*
cpe:2.3:a:entrouvert:lasso:2.0.0-1:*:*:*:*:*:*:*

More vulnerabilities in Entrouvert Lasso

CVE-2025-47151 — Critical (CVSS 9.8): A type confusion vulnerability exists in the lasso_node_impl_init_from_xml functionality of Entr'ouvert Lasso 2.5.1…
CVE-2025-46784 — High (CVSS 7.5): A denial of service vulnerability exists in the lasso_node_init_from_message_with_format functionality of…
CVE-2025-46705 — High (CVSS 7.5): A denial of service vulnerability exists in the g_assert_not_reached functionality of Entr'ouvert Lasso 2.5.1 and…
CVE-2025-46404 — High (CVSS 7.5): A denial of service vulnerability exists in the lasso_provider_verify_saml_signature functionality of Entr'ouvert…
CVE-2021-28091 — High (CVSS 7.5): Lasso all versions prior to 2.7.0 has improper verification of a cryptographic signature.
CVE-2015-1783 — High (CVSS 7.5): The prefix variable in the get_or_define_ns function in Lasso before commit 6d854cef4211cdcdbc7446c978f23ab859847cdd…

All CVEs affecting Entrouvert Lasso →

Other CWE-20 (Improper Input Validation) vulnerabilities

CVE-2026-48316 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
CVE-2026-48281 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
CVE-2026-48277 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
CVE-2026-48055 — Critical (CVSS 10.0): Streambert is a cross-platform Electron Desktop App to stream and download any video media. In versions 2.4.0 and…
CVE-2026-34910 — Critical (CVSS 10.0): A malicious actor with access to the network could exploit an Improper Input Validation vulnerability found in UniFi OS…
CVE-2026-33587 — Critical (CVSS 10.0): Lack of user input sanitisation in Open Notebook v1.8.3 allows the application user to execute Python code (and…

Browse all CWE-20 (Improper Input Validation) vulnerabilities →