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CVE-2021-39191

URL Redirection to Untrusted Site ('Open Redirect') in mod_auth_openidc

mod_auth_openidc is an authentication/authorization module for the Apache 2.x HTTP server that functions as an OpenID Connect Relying Party, authenticating users against an OpenID Connect Provider. In versions prior to 2.4.9.4, the 3rd-party init SSO functionality of mod_auth_openidc was reported to be vulnerable to an open redirect attack by supplying a crafted URL in the `target_link_uri` parameter. A patch in version 2.4.9.4 made it so that the `OIDCRedirectURLsAllowed` setting must be applied to the `target_link_uri` parameter. There are no known workarounds aside from upgrading to a patched version.

CVSS 3.1 · 4.7 Medium EPSS 1.7% KEV · Not listed
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CVE-2021-38509

Mozilla: Javascript alert box could have been spoofed onto an arbitrary domain

Due to an unusual sequence of attacker-controlled events, a Javascript alert() dialog with arbitrary (although unstyled) contents could be displayed over top an uncontrolled webpage of the attacker's choosing. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.

CVSS 3.1 · 4.3 Medium EPSS 1.8% KEV · Not listed
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CVE-2021-38508

Mozilla: Permission Prompt could be overlaid, resulting in user confusion and potential spoofing

By displaying a form validity message in the correct location at the same time as a permission prompt (such as for geolocation), the validity message could have obscured the prompt, resulting in the user potentially being tricked into granting the permission. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.

CVSS 3.1 · 4.3 Medium EPSS 1.6% KEV · Not listed
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CVE-2021-38507

Mozilla: Opportunistic Encryption in HTTP2 could be used to bypass the Same-Origin-Policy on services hosted on other ports

The Opportunistic Encryption feature of HTTP2 (RFC 8164) allows a connection to be transparently upgraded to TLS while retaining the visual properties of an HTTP connection, including being same-origin with unencrypted connections on port 80. However, if a second encrypted port on the same IP address (e.g. port 8443) did not opt-in to opportunistic encryption; a network attacker could forward a connection from the browser to port 443 to port 8443, causing the browser to treat the content of port 8443 as same-origin with HTTP. This was resolved by disabling the Opportunistic Encryption feature, which had low usage. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
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CVE-2021-38506

Mozilla: Firefox could be coaxed into going into fullscreen mode without notification or warning

Through a series of navigations, Firefox could have entered fullscreen mode without notification or warning to the user. This could lead to spoofing attacks on the browser UI including phishing. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.

CVSS 3.1 · 4.3 Medium EPSS 1.5% KEV · Not listed
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CVE-2021-38504

Mozilla: Use-after-free in file picker dialog

When interacting with an HTML input element's file picker dialog with webkitdirectory set, a use-after-free could have resulted, leading to memory corruption and a potentially exploitable crash. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.

CVSS 3.1 · 8.8 High EPSS 1.8% KEV · Not listed
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CVE-2021-38503

Mozilla: iframe sandbox rules did not apply to XSLT stylesheets

The iframe sandbox rules were not correctly applied to XSLT stylesheets, allowing an iframe to bypass restrictions such as executing scripts or navigating the top-level frame. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.

CVSS 3.1 · 10.0 Critical EPSS 4.1% KEV · Not listed
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CVE-2021-38502

Mozilla: Downgrade attack on SMTP STARTTLS connections

Thunderbird ignored the configuration to require STARTTLS security for an SMTP connection. A MITM could perform a downgrade attack to intercept transmitted messages, or could take control of the authenticated session to execute SMTP commands chosen by the MITM. If an unprotected authentication method was configured, the MITM could obtain the authentication credentials, too. This vulnerability affects Thunderbird < 91.2.

CVSS 3.1 · 5.9 Medium EPSS 1.1% KEV · Not listed
CVE-2021-38500

Mozilla: Memory safety bugs fixed in Firefox 93, Firefox ESR 78.15, and Firefox ESR 91.2

Mozilla developers reported memory safety bugs present in Firefox 92 and Firefox ESR 91.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Thunderbird < 78.15, Thunderbird < 91.2, Firefox ESR < 91.2, Firefox ESR < 78.15, and Firefox < 93.

CVSS 3.1 · 8.8 High EPSS 1.3% KEV · Not listed
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CVE-2021-38496

Mozilla: Use-after-free in MessageTask

During operations on MessageTasks, a task may have been removed while it was still scheduled, resulting in memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 78.15, Thunderbird < 91.2, Firefox ESR < 91.2, Firefox ESR < 78.15, and Firefox < 93.

CVSS 3.1 · 8.8 High EPSS 1.7% KEV · Not listed
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CVE-2021-38300

kernel: crafting anomalous machine code may lead to arbitrary Kernel code execution

arch/mips/net/bpf_jit.c in the Linux kernel before 5.4.10 can generate undesirable machine code when transforming unprivileged cBPF programs, allowing execution of arbitrary code within the kernel context. This occurs because conditional branches can exceed the 128 KB limit of the MIPS architecture.

CVSS 3.1 · 7.8 High EPSS < 1% KEV · Not listed
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CVE-2021-38291

FFmpeg version (git commit de8e6e67e7523e48bb27ac224a0b446df05e1640) suffers from a an assertion failure at src/libavutil/mathematics.c.

CVSS 3.1 · 7.5 High EPSS 2.7% KEV · Not listed
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CVE-2021-38205

kernel: drivers/net/ethernet/xilinx/xilinx_emaclite.c prints the real IOMEM pointer

drivers/net/ethernet/xilinx/xilinx_emaclite.c in the Linux kernel before 5.13.3 makes it easier for attackers to defeat an ASLR protection mechanism because it prints a kernel pointer (i.e., the real IOMEM pointer).

CVSS 3.1 · 3.3 Low EPSS < 1% KEV · Not listed
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CVE-2021-38204

kernel: use-after-free and panic in drivers/usb/host/max3421-hcd.c by removing a MAX-3421 USB device in certain situations

drivers/usb/host/max3421-hcd.c in the Linux kernel before 5.13.6 allows physically proximate attackers to cause a denial of service (use-after-free and panic) by removing a MAX-3421 USB device in certain situations.

CVSS 3.1 · 6.8 Medium EPSS < 1% KEV · Not listed
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CVE-2021-38171

adts_decode_extradata in libavformat/adtsenc.c in FFmpeg 4.4 does not check the init_get_bits return value, which is a necessary step because the second argument to init_get_bits can be crafted.

CVSS 3.1 · 9.8 Critical EPSS 2.4% KEV · Not listed
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CVE-2021-38165

lynx: Disclosure of HTTP authentication credentials via SNI data

Lynx through 2.8.9 mishandles the userinfo subcomponent of a URI, which allows remote attackers to discover cleartext credentials because they may appear in SNI data.

CVSS 3.1 · 5.3 Medium EPSS 3.9% KEV · Not listed
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Debian Linux Fedora Lynx and 1 more
CVE-2021-38161

Not validating origin TLS certificate

Improper Authentication vulnerability in TLS origin verification of Apache Traffic Server allows for man in the middle attacks. This issue affects Apache Traffic Server 8.0.0 to 8.0.8.

CVSS 3.1 · 8.1 High EPSS 1.9% KEV · Not listed
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