CVE-2009-2071

CVE-2009-2071 is a medium-severity vulnerability in Google Chrome with a CVSS 2.0 base score of 6.8. 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 6.8)
• EPSS exploit prediction: 1% (59th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-287
• Affected product: Google Chrome
• Published: 2009-06-15
• Last modified: 2026-06-16

Description

Google Chrome before 1.0.154.53 displays a cached certificate for a (1) 4xx or (2) 5xx CONNECT response page returned by a proxy server, which allows man-in-the-middle attackers to spoof an arbitrary https site by letting a browser obtain a valid certificate from this site during one request, and then sending the browser a crafted 502 response page upon a subsequent request.

Frequently asked questions

What is CVE-2009-2071?

Google Chrome before 1.0.154.53 displays a cached certificate for a (1) 4xx or (2) 5xx CONNECT response page returned by a proxy server, which allows man-in-the-middle attackers to spoof an arbitrary https site by letting a browser obtain a valid certificate from this site during one request, and then sending the browser a crafted 502 response page upon a subsequent request.

How severe is CVE-2009-2071?

CVE-2009-2071 has a CVSS 2.0 base score of 6.8, rated medium severity.

Is CVE-2009-2071 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-2071?

CVE-2009-2071 primarily affects Google Chrome. In total, 16 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-2071?

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

When was CVE-2009-2071 published?

CVE-2009-2071 was published on 2009-06-15 and last updated on 2026-06-16.

References

• http://code.google.com/p/chromium/issues/detail?id=7338
• http://code.google.com/p/chromium/issues/detail?id=8473
• http://research.microsoft.com/apps/pubs/default.aspx?id=79323
• http://research.microsoft.com/pubs/79323/pbp-final-with-update.pdf
• http://sites.google.com/a/chromium.org/dev/getting-involved/dev-channel/release-notes/releasenotes1015453
• http://src.chromium.org/viewvc/chrome/branches/release_154.next/src/net/http/http_transaction_winhttp.cc?r1=11621&r2=11669&pathrev=11669
• http://src.chromium.org/viewvc/chrome?view=rev&revision=11669
• http://www.securityfocus.com/bid/35411
• https://bugzilla.mozilla.org/show_bug.cgi?id=479880

Affected products (16)

• cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:*
• cpe:2.3:a:google:chrome:0.2.149.29:*:*:*:*:*:*:*
• cpe:2.3:a:google:chrome:0.2.149.30:*:*:*:*:*:*:*
• cpe:2.3:a:google:chrome:0.2.152.1:*:*:*:*:*:*:*
• cpe:2.3:a:google:chrome:0.2.153.1:*:*:*:*:*:*:*
• cpe:2.3:a:google:chrome:0.3.154.0:*:*:*:*:*:*:*
• cpe:2.3:a:google:chrome:0.3.154.3:*:*:*:*:*:*:*
• cpe:2.3:a:google:chrome:0.4.154.18:*:*:*:*:*:*:*
• cpe:2.3:a:google:chrome:0.4.154.22:*:*:*:*:*:*:*
• cpe:2.3:a:google:chrome:0.4.154.31:*:*:*:*:*:*:*
• cpe:2.3:a:google:chrome:0.4.154.33:*:*:*:*:*:*:*
• cpe:2.3:a:google:chrome:1.0.154.36:*:*:*:*:*:*:*
• cpe:2.3:a:google:chrome:1.0.154.39:*:*:*:*:*:*:*
• cpe:2.3:a:google:chrome:1.0.154.42:*:*:*:*:*:*:*
• cpe:2.3:a:google:chrome:1.0.154.43:*:*:*:*:*:*:*
• cpe:2.3:a:google:chrome:1.0.154.46:*:*:*:*:*:*:*

More vulnerabilities in Google Chrome

• CVE-2026-13782 — Critical (CVSS 10.0): Use after free in Browser in Google Chrome prior to 150.0.7871.47 allowed a remote attacker who had compromised the…
• CVE-2015-8548 — Critical (CVSS 10.0): Multiple unspecified vulnerabilities in Google V8 before 4.7.80.23, as used in Google Chrome before 47.0.2526.80, allow…
• CVE-2015-6791 — Critical (CVSS 10.0): Multiple unspecified vulnerabilities in Google Chrome before 47.0.2526.80 allow attackers to cause a denial of service…
• CVE-2015-6788 — Critical (CVSS 10.0): The ObjectBackedNativeHandler class in extensions/renderer/object_backed_native_handler.cc in the extensions subsystem…
• CVE-2015-8480 — Critical (CVSS 10.0): The VideoFramePool::PoolImpl::CreateFrame function in media/base/video_frame_pool.cc in Google Chrome before…
• CVE-2015-6787 — Critical (CVSS 10.0): Multiple unspecified vulnerabilities in Google Chrome before 47.0.2526.73 allow attackers to cause a denial of service…

All CVEs affecting Google Chrome →

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 →