How severe is CVE-2009-2057?

CVE-2009-2057 has a CVSS 2.0 base score of 5.8, rated medium severity.

Is CVE-2009-2057 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-2057?

CVE-2009-2057 primarily affects Microsoft Ie. In total, 94 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-2057?

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

When was CVE-2009-2057 published?

CVE-2009-2057 was published on 2009-06-15 and last updated on 2026-06-16.

CVE-2009-2057

CVE-2009-2057 is a medium-severity vulnerability in Microsoft Ie with a CVSS 2.0 base score of 5.8. 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-287.

Key facts

Severity: Medium (CVSS 2.0 base score 5.8)
EPSS exploit prediction: 3% (86th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Microsoft Ie
Published: 2009-06-15
Last modified: 2026-06-16

Description

Microsoft Internet Explorer before 8 uses the HTTP Host header to determine the context of a document provided in a (1) 4xx or (2) 5xx CONNECT response from a proxy server, which allows man-in-the-middle attackers to execute arbitrary web script by modifying this CONNECT response, aka an "SSL tampering" attack.

Frequently asked questions

What is CVE-2009-2057?: Microsoft Internet Explorer before 8 uses the HTTP Host header to determine the context of a document provided in a (1) 4xx or (2) 5xx CONNECT response from a proxy server, which allows man-in-the-middle attackers to execute arbitrary web script by modifying this CONNECT response, aka an "SSL tampering" attack.
How severe is CVE-2009-2057?: CVE-2009-2057 has a CVSS 2.0 base score of 5.8, rated medium severity.
Is CVE-2009-2057 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-2057?: CVE-2009-2057 primarily affects Microsoft Ie. In total, 94 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-2057?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2009-2057 published?: CVE-2009-2057 was published on 2009-06-15 and last updated on 2026-06-16.

References

Affected products (94)

cpe:2.3:a:microsoft:ie:5.0:sp1:*:*:*:*:*:*
cpe:2.3:a:microsoft:ie:5.0:sp4:*:*:*:*:*:*
cpe:2.3:a:microsoft:ie:5.22:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:ie:6.0:sp1:*:*:*:*:*:*
cpe:2.3:a:microsoft:ie:6.0:sp2:*:*:*:*:*:*
cpe:2.3:a:microsoft:internet_explorer:3.0:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:internet_explorer:3.0.1:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:internet_explorer:3.0.2:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:internet_explorer:3.1:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:internet_explorer:3.2:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:internet_explorer:4.0:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:internet_explorer:4.0.1:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:internet_explorer:4.0.1:sp1:*:*:*:*:*:*
cpe:2.3:a:microsoft:internet_explorer:4.0.1:sp2:*:*:*:*:*:*
cpe:2.3:a:microsoft:internet_explorer:4.01:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:internet_explorer:4.1:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:internet_explorer:4.01:sp1:*:*:*:*:*:*
cpe:2.3:a:microsoft:internet_explorer:4.5:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:internet_explorer:4.40.308:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:internet_explorer:4.40.520:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:internet_explorer:4.70.1155:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:internet_explorer:4.70.1158:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:internet_explorer:4.70.1215:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:internet_explorer:4.70.1300:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:internet_explorer:4.71.544:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:internet_explorer:4.71.1008.3:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:internet_explorer:4.71.1712.6:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:internet_explorer:4.72.2106.8:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:internet_explorer:4.72.3110.8:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:internet_explorer:4.72.3612.1713:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:internet_explorer:5:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:internet_explorer:5.0:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:internet_explorer:5.0.1:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:internet_explorer:5.0.1:sp1:*:*:*:*:*:*
cpe:2.3:a:microsoft:internet_explorer:5.0.1:sp2:*:*:*:*:*:*
cpe:2.3:a:microsoft:internet_explorer:5.0.1:sp3:*:*:*:*:*:*
cpe:2.3:a:microsoft:internet_explorer:5.0.1:sp4:*:*:*:*:*:*
cpe:2.3:a:microsoft:internet_explorer:5.00.0518.10:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:internet_explorer:5.00.0910.1309:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:internet_explorer:5.00.2014.0216:*:*:*:*:*:*:*

More vulnerabilities in Microsoft Ie

CVE-2007-0219 — Critical (CVSS 10.0): Microsoft Internet Explorer 5.01, 6, and 7 uses certain COM objects from (1) Msb1fren.dll, (2) Htmlmm.ocx, and (3)…
CVE-2007-0217 — Critical (CVSS 10.0): The wininet.dll FTP client code in Microsoft Internet Explorer 5.01 and 6 might allow remote attackers to execute…
CVE-2006-1186 — Critical (CVSS 10.0): Microsoft Internet Explorer 5.01 through 6 allows remote attackers to execute arbitrary code via by instantiating the…
CVE-2004-0985 — Critical (CVSS 10.0): Internet Explorer 6.x on Windows XP SP2 allows remote attackers to execute arbitrary code, as demonstrated using a…
CVE-2004-1050 — Critical (CVSS 10.0): Heap-based buffer overflow in Internet Explorer 6 allows remote attackers to execute arbitrary code via long (1) SRC or…
CVE-2004-0216 — Critical (CVSS 10.0): Integer overflow in the Install Engine (inseng.dll) for Internet Explorer 5.01, 5.5, and 6 allows remote attackers to…

All CVEs affecting Microsoft Ie →

Other CWE-287 (Improper Authentication) vulnerabilities

CVE-2026-45480 — Critical (CVSS 10.0): Improper authentication in Azure Active Directory allows an unauthorized attacker to elevate privileges over a network.
CVE-2026-46389 — Critical (CVSS 10.0): UDS Identity Config builds the Keycloak configuration image (realm, plugins, theme, truststore, JARs) consumed by UDS…
CVE-2026-10611 — Critical (CVSS 10.0): An authentication bypass vulnerability exists in MISP when LDAP mixed authentication is enabled with OTP enforcement.…
CVE-2026-47280 — Critical (CVSS 10.0): Improper authentication in Azure Resource Manager (ARM) allows an unauthorized attacker to elevate privileges over a…
CVE-2026-42822 — Critical (CVSS 10.0): Improper authentication in Azure Local Disconnected Operations allows an unauthorized attacker to elevate privileges…
CVE-2026-20182 — Critical (CVSS 10.0): May 2026: This security advisory provides the details and fix information for a vulnerability that was discovered and…

Browse all CWE-287 (Improper Authentication) vulnerabilities →