CVE-2021-41773
CriticalSummary
W Apache HTTP Server 2.4.49 znaleziono lukę w normalizacji ścieżek, która umożliwia atak typu path traversal. Atakujący może uzyskać dostęp do plików poza skonfigurowanymi katalogami, co może prowadzić do zdalnego wykonania kodu, jeśli skrypty CGI są włączone dla tych ścieżek.
Risk Assessment
Luka ta stwarza poważne ryzyko dla organizacji, ponieważ może prowadzić do nieautoryzowanego dostępu do plików oraz zdalnego wykonania kodu. Jest znana z aktywnego wykorzystywania w atakach w sieci.
Recommendation
Zaleca się aktualizację do Apache HTTP Server 2.4.50 lub nowszej wersji, a także wdrożenie odpowiednich zabezpieczeń, aby chronić pliki poza skonfigurowanymi katalogami.
Related vulnerabilities
- CVE-2026-87827Critical
Certain KGUARD DVR devices running vulnerable firmware expose a system command execution service on all network interfaces without requiring authentication. A remote unauthenticated attacker can execute arbitrary system commands, potentially leading to complete compromise. Exploited by Mirai_ptea and Mirai_aurora botnets for malware propagation and DDoS.
- CVE-2026-85978Critical
An unauthenticated remote code execution vulnerability exists in the Policy Manager console of Akana API Platform. A path normalization discrepancy allows authentication bypass and access to an endpoint that executes attacker-supplied script code without sandboxing, leading to arbitrary code execution.
- CVE-2026-79696Critical
A Code Injection vulnerability in adk web in Google Cloud Agent Development Kit (ADK) for Python versions 2.0.0 through 2.6.0 on Python (OSS), Cloud Run, and GKE environments where pytest is installed allows an unauthenticated remote attacker to execute arbitrary code using a crafted test session replay.
- CVE-2026-16272Critical
Use of less trusted source vulnerability in PayTR Virtual Pos iFrame API (v9x) WHMCS Module allows Exploitation of Trusted Identifiers. This issue affects versions from v9.0.0 before v9.0.3.
- CVE-2026-21102Critical
Use-after-free vulnerability in DualDAR prior to SMR Sep-2026 Release 1 allows local privileged attackers to execute arbitrary code with root privilege.
- CVE-2026-21096Critical
Heap-based buffer overflow in JPEG decoder of libimagecodec.quram.so prior to SMR Sep-2026 Release 1 allows remote attackers to execute arbitrary code.
- CVE-2026-21095Critical
Heap-based buffer overflow in DNG decoder of libimagecodec.quram.so prior to SMR Sep-2026 Release 1 allows remote attackers to execute arbitrary code.
- CVE-2026-53939Critical
In cjose versions 0.6.1 through 0.6.2.5, when encrypting a JWE using AES-CBC-HMAC content-encryption algorithms (A128CBC-HS256, A192CBC-HS384, A256CBC-HS512) with any key-management algorithm that generates a fresh content-encryption key (CEK), the CEK is all zero bytes instead of being randomly generated. The resulting JWE is encrypted and authenticated under a fixed, publicly known key, allowing anyone who obtains the JWE to recover plaintext and forge or modify content. Fixed in 0.6.2.6 by generating CEK from RAND_bytes.
- CVE-2026-53581Critical
OPNsense is a FreeBSD based firewall and routing platform. Prior to version 26.1.9 of opnsense/core and version 26.4_20 of BE/opnsense/core, a path traversal vulnerability in the NTP configuration module allows an attacker to overwrite arbitrary files on the system as the root user. By manipulating the GPS or PPS serial port parameter, an attacker with access to the NTP configuration can escape the intended directory and write user-controlled data to any file.
- CVE-2026-85982Critical
The Auth0 AD/LDAP Connector is vulnerable to stored Cross-Site Scripting (XSS) issues due to improper HTML encoding of data in search results and updater log content displayed in the admin panel. An authenticated user with privileges to modify directory attributes, or a low-privileged local user on the host, could insert script content that executes in an administrator's browser.
Original NVD description (English source)
A flaw was found in a change made to path normalization in Apache HTTP Server 2.4.49. An attacker could use a path traversal attack to map URLs to files outside the directories configured by Alias-like directives. If files outside of these directories are not protected by the usual default configuration "require all denied", these requests can succeed. If CGI scripts are also enabled for these aliased pathes, this could allow for remote code execution. This issue is known to be exploited in the wild. This issue only affects Apache 2.4.49 and not earlier versions. The fix in Apache HTTP Server 2.4.50 was found to be incomplete, see CVE-2021-42013.

