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CVE-2021-28116

squid: out-of-bounds read in WCCP protocol data may lead to information disclosure

Squid through 4.14 and 5.x through 5.0.5, in some configurations, allows information disclosure because of an out-of-bounds read in WCCP protocol data. This can be leveraged as part of a chain for remote code execution as nobody.

CVSS 3.1 · 3.7 Low EPSS 12.9% KEV · Not listed
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CVE-2021-27291

python-pygments: ReDoS in multiple lexers

In pygments 1.1+, fixed in 2.7.4, the lexers used to parse programming languages rely heavily on regular expressions. Some of the regular expressions have exponential or cubic worst-case complexity and are vulnerable to ReDoS. By crafting malicious input, an attacker can cause a denial of service.

CVSS 3.1 · 7.5 High EPSS 3.9% KEV · Not listed
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CVE-2021-27135

xterm: crash when processing combining characters

xterm before Patch #366 allows remote attackers to execute arbitrary code or cause a denial of service (segmentation fault) via a crafted UTF-8 combining character sequence.

CVSS 3.1 · 9.8 Critical EPSS 7.9% KEV · Not listed
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CVE-2021-27025

puppet: silent configuration failure in agent

A flaw was discovered in Puppet Agent where the agent may silently ignore Augeas settings or may be vulnerable to a Denial of Service condition prior to the first 'pluginsync'.

CVSS 3.1 · 6.5 Medium EPSS 1.1% KEV · Not listed
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CVE-2021-26691

Apache HTTP Server mod_session response handling heap overflow

In Apache HTTP Server versions 2.4.0 to 2.4.46 a specially crafted SessionHeader sent by an origin server could cause a heap overflow

CVSS 3.1 · 9.8 Critical EPSS 68.1% KEV · Not listed
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CVE-2021-26690

mod_session NULL pointer dereference

Apache HTTP Server versions 2.4.0 to 2.4.46 A specially crafted Cookie header handled by mod_session can cause a NULL pointer dereference and crash, leading to a possible Denial Of Service

CVSS 3.1 · 7.5 High EPSS 65.1% KEV · Not listed
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CVE-2021-25636

Incorrect trust validation of signature with ambiguous KeyInfo children

LibreOffice supports digital signatures of ODF documents and macros within documents, presenting visual aids that no alteration of the document occurred since the last signing and that the signature is valid. An Improper Certificate Validation vulnerability in LibreOffice allowed an attacker to create a digitally signed ODF document, by manipulating the documentsignatures.xml or macrosignatures.xml stream within the document to contain both "X509Data" and "KeyValue" children of the "KeyInfo" tag, which when opened caused LibreOffice to verify using the "KeyValue" but to report verification with the unrelated "X509Data" value. This issue affects: The Document Foundation LibreOffice 7.2 versions prior to 7.2.5.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
CVE-2021-25220

DNS forwarders - cache poisoning vulnerability

BIND 9.11.0 -> 9.11.36 9.12.0 -> 9.16.26 9.17.0 -> 9.18.0 BIND Supported Preview Editions: 9.11.4-S1 -> 9.11.36-S1 9.16.8-S1 -> 9.16.26-S1 Versions of BIND 9 earlier than those shown - back to 9.1.0, including Supported Preview Editions - are also believed to be affected but have not been tested as they are EOL. The cache could become poisoned with incorrect records leading to queries being made to the wrong servers, which might also result in false information being returned to clients.

CVSS 3.1 · 6.8 Medium EPSS 3.5% KEV · Not listed
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Fedora Bind Junos and 47 more
CVE-2021-25219

Lame cache can be abused to severely degrade resolver performance

In BIND 9.3.0 -> 9.11.35, 9.12.0 -> 9.16.21, and versions 9.9.3-S1 -> 9.11.35-S1 and 9.16.8-S1 -> 9.16.21-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -> 9.17.18 of the BIND 9.17 development branch, exploitation of broken authoritative servers using a flaw in response processing can cause degradation in BIND resolver performance. The way the lame cache is currently designed makes it possible for its internal data structures to grow almost infinitely, which may cause significant delays in client query processing.

CVSS 3.1 · 5.3 Medium EPSS 11.2% KEV · Not listed
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Debian Fedoraproject Isc and 4 more
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Debian Linux Fedora Bind and 21 more
CVE-2021-25217

A buffer overrun in lease file parsing code can be used to exploit a common vulnerability shared by dhcpd and dhclient

In ISC DHCP 4.1-ESV-R1 -> 4.1-ESV-R16, ISC DHCP 4.4.0 -> 4.4.2 (Other branches of ISC DHCP (i.e., releases in the 4.0.x series or lower and releases in the 4.3.x series) are beyond their End-of-Life (EOL) and no longer supported by ISC. From inspection it is clear that the defect is also present in releases from those series, but they have not been officially tested for the vulnerability), The outcome of encountering the defect while reading a lease that will trigger it varies, according to: the component being affected (i.e., dhclient or dhcpd) whether the package was built as a 32-bit or 64-bit binary whether the compiler flag -fstack-protection-strong was used when compiling In dhclient, ISC has not successfully reproduced the error on a 64-bit system. However, on a 32-bit system it is possible to cause dhclient to crash when reading an improper lease, which could cause network connectivity problems for an affected system due to the absence of a running DHCP client process. In dhcpd, when run in DHCPv4 or DHCPv6 mode: if the dhcpd server binary was built for a 32-bit architecture AND the -fstack-protection-strong flag was specified to the compiler, dhcpd may exit while parsing a lease file containing an objectionable lease, resulting in lack of service to clients. Additionally, the offending lease and the lease immediately following it in the lease database may be improperly deleted. if the dhcpd server binary was built for a 64-bit architecture OR if the -fstack-protection-strong compiler flag was NOT specified, the crash will not occur, but it is possible for the offending lease and the lease which immediately followed it to be improperly deleted.

CVSS 3.1 · 7.4 High EPSS 6.1% KEV · Not listed
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Debian Fedoraproject Isc and 3 more
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Debian Linux Fedora Dhcp and 30 more
CVE-2021-25215

An assertion check can fail while answering queries for DNAME records that require the DNAME to be processed to resolve itself

In BIND 9.0.0 -> 9.11.29, 9.12.0 -> 9.16.13, and versions BIND 9.9.3-S1 -> 9.11.29-S1 and 9.16.8-S1 -> 9.16.13-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -> 9.17.11 of the BIND 9.17 development branch, when a vulnerable version of named receives a query for a record triggering the flaw described above, the named process will terminate due to a failed assertion check. The vulnerability affects all currently maintained BIND 9 branches (9.11, 9.11-S, 9.16, 9.16-S, 9.17) as well as all other versions of BIND 9.

CVSS 3.1 · 7.5 High EPSS 11.7% KEV · Not listed
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Debian Fedoraproject Isc and 4 more
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Debian Linux Fedora Bind and 28 more
CVE-2021-25214

A broken inbound incremental zone update (IXFR) can cause named to terminate unexpectedly

In BIND 9.8.5 -> 9.8.8, 9.9.3 -> 9.11.29, 9.12.0 -> 9.16.13, and versions BIND 9.9.3-S1 -> 9.11.29-S1 and 9.16.8-S1 -> 9.16.13-S1 of BIND 9 Supported Preview Edition, as well as release versions 9.17.0 -> 9.17.11 of the BIND 9.17 development branch, when a vulnerable version of named receives a malformed IXFR triggering the flaw described above, the named process will terminate due to a failed assertion the next time the transferred secondary zone is refreshed.

CVSS 3.1 · 6.5 Medium EPSS 6.4% KEV · Not listed
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Debian Fedoraproject Isc and 3 more
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Debian Linux Fedora Bind and 22 more