There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

  - Null pointer dereference was found in upx PackLinuxElf::canUnpack() in p_lx_elf.cpp,in version UPX 4.0.0.
    That allow attackers to execute arbitrary code and cause a denial of service via a crafted file.
    (CVE-2021-30500)

  - A heap buffer overflow read was discovered in upx 4.0.0, because the check in p_lx_elf.cpp is not perfect.
    (CVE-2020-24119)

  - A heap-based buffer over-read was discovered in the invert_pt_dynamic function in p_lx_elf.cpp in UPX
    4.0.0 via a crafted Mach-O file. (CVE-2020-27796)

  - An invalid memory address reference was discovered in the elf_lookup function in p_lx_elf.cpp in UPX 4.0.0
    via a crafted Mach-O file. (CVE-2020-27797)

  - An invalid memory address reference was discovered in the adjABS function in p_lx_elf.cpp in UPX 4.0.0 via
    a crafted Mach-O file. (CVE-2020-27798)

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - Null pointer dereference was found in upx PackLinuxElf::canUnpack() in p_lx_elf.cpp,in version UPX 4.0.0.
    That allow attackers to execute arbitrary code and cause a denial of service via a crafted file.
    (CVE-2021-30500)

Note that Nessus relies on the presence of the package as reported by the vendor.

The remote openSUSE 15 host has a package installed that is affected by multiple vulnerabilities as referenced in the openSUSE-SU-2023:0088-1 advisory.

  - A flaw was found in upx canPack in p_lx_elf.cpp in UPX 3.96. This flaw allows attackers to cause a denial     of service (SEGV or buffer overflow and application crash) or possibly have unspecified other impacts via     a crafted ELF. The highest threat from this vulnerability is to system availability. (CVE-2021-20285)

  - Null pointer dereference was found in upx PackLinuxElf::canUnpack() in p_lx_elf.cpp,in version UPX 4.0.0.
    That allow attackers to execute arbitrary code and cause a denial of service via a crafted file.
    (CVE-2021-30500)

  - An assertion abort was found in upx MemBuffer::alloc() in mem.cpp, in version UPX 4.0.0. The flow allows     attackers to cause a denial of service (abort) via a crafted file. (CVE-2021-30501)

  - A heap-based buffer overflow was discovered in upx, during the generic pointer 'p' points to an     inaccessible address in func get_le32(). The problem is essentially caused in PackLinuxElf32::elf_lookup()     at p_lx_elf.cpp:5382. (CVE-2021-43311)

  - A heap-based buffer overflow was discovered in upx, during the variable 'bucket' points to an inaccessible     address. The issue is being triggered in the function PackLinuxElf64::invert_pt_dynamic at     p_lx_elf.cpp:5239. (CVE-2021-43312)

  - A heap-based buffer overflow was discovered in upx, during the variable 'bucket' points to an inaccessible     address. The issue is being triggered in the function PackLinuxElf32::invert_pt_dynamic at     p_lx_elf.cpp:1688. (CVE-2021-43313)

  - A heap-based buffer overflows was discovered in upx, during the generic pointer 'p' points to an     inaccessible address in func get_le32(). The problem is essentially caused in PackLinuxElf32::elf_lookup()     at p_lx_elf.cpp:5368 (CVE-2021-43314)

  - A heap-based buffer overflows was discovered in upx, during the generic pointer 'p' points to an     inaccessible address in func get_le32(). The problem is essentially caused in PackLinuxElf32::elf_lookup()     at p_lx_elf.cpp:5349 (CVE-2021-43315)

  - A heap-based buffer overflow was discovered in upx, during the generic pointer 'p' points to an     inaccessible address in func get_le64(). (CVE-2021-43316)

  - A heap-based buffer overflows was discovered in upx, during the generic pointer 'p' points to an     inaccessible address in func get_le32(). The problem is essentially caused in PackLinuxElf64::elf_lookup()     at p_lx_elf.cpp:5404 (CVE-2021-43317)

  - A heap-based buffer overflow issue was discovered in UPX in PackTmt::pack() in p_tmt.cpp file. The flow     allows an attacker to cause a denial of service (abort) via a crafted file. (CVE-2023-23456)

  - A Segmentation fault was found in UPX in PackLinuxElf64::invert_pt_dynamic() in p_lx_elf.cpp. An attacker     with a crafted input file allows invalid memory address access that could lead to a denial of service.
    (CVE-2023-23457)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Published	Updated	Severity
427474	Alpine: multiple upx packages: security update to 4.0.0-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	5/16/2025	7/2/2026	high
427474	Alpine: multiple upx packages: security update to 4.0.0-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	5/16/2025	7/2/2026	high
223733	Linux Distros Unpatched Vulnerability : CVE-2021-30500	Nessus	Misc.	3/4/2025	7/12/2026	high
174145	openSUSE 15 Security Update : upx (openSUSE-SU-2023:0088-1)	Nessus	SuSE Local Security Checks	4/12/2023	4/19/2023	high

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