CVE-2021-30500

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.

CVSS v3 7.8 HIGH
CVSS v2.0 6.8 MEDIUM

7.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

6.8^/10

CVSS v2.0 : MEDIUM

Vector : AV:N/AC:M/Au:N/C:P/I:P/A:P

Exploitability : 8.6 / Impact : 6.4

Access Vector NETWORK

Access Complexity MEDIUM

Authentication NONE

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact PARTIAL

References

Link	Resource
https://bugzilla.redhat.com/show_bug.cgi?id=1948692	Issue Tracking Third Party Advisory
https://github.com/upx/upx/commit/90279abdfcd235172eab99651043051188938dcc	Patch Third Party Advisory
https://github.com/upx/upx/issues/485	Exploit Issue Tracking Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1948692	Issue Tracking Third Party Advisory
https://github.com/upx/upx/commit/90279abdfcd235172eab99651043051188938dcc	Patch Third Party Advisory
https://github.com/upx/upx/issues/485	Exploit Issue Tracking Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:upx:upx:4.0.0:*:*:*:*:*:*:*

Configuration 2 (hide)

cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*

Configuration 3 (hide)

cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*

History

11 Apr 2025, 12:27

Type	Values Removed	Values Added
CPE	cpe:2.3:a:upx_project:upx:4.0.0:::::::*	cpe:2.3:a:upx:upx:4.0.0:::::::*
First Time		Upx Upx upx

Information

Published : 2021-05-27 00:15

Updated : 2025-04-11 12:27

NVD link : CVE-2021-30500

Mitre link : CVE-2021-30500

CVE.ORG link : CVE-2021-30500

JSON object : View

Products Affected

fedoraproject

fedora

redhat

enterprise_linux

upx

upx

CWE

CWE-476

NULL Pointer Dereference

{"id": "CVE-2021-30500", "cveTags": [], "metrics": {"cvssMetricV2": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"version": "2.0", "baseScore": 6.8, "accessVector": "NETWORK", "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:P", "authentication": "NONE", "integrityImpact": "PARTIAL", "accessComplexity": "MEDIUM", "availabilityImpact": "PARTIAL", "confidentialityImpact": "PARTIAL"}, "acInsufInfo": false, "impactScore": 6.4, "baseSeverity": "MEDIUM", "obtainAllPrivilege": false, "exploitabilityScore": 8.6, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": true}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.8}]}, "published": "2021-05-27T00:15:08.483", "references": [{"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1948692", "tags": ["Issue Tracking", "Third Party Advisory"], "source": "secalert@redhat.com"}, {"url": "https://github.com/upx/upx/commit/90279abdfcd235172eab99651043051188938dcc", "tags": ["Patch", "Third Party Advisory"], "source": "secalert@redhat.com"}, {"url": "https://github.com/upx/upx/issues/485", "tags": ["Exploit", "Issue Tracking", "Third Party Advisory"], "source": "secalert@redhat.com"}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1948692", "tags": ["Issue Tracking", "Third Party Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://github.com/upx/upx/commit/90279abdfcd235172eab99651043051188938dcc", "tags": ["Patch", "Third Party Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://github.com/upx/upx/issues/485", "tags": ["Exploit", "Issue Tracking", "Third Party Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Primary", "source": "secalert@redhat.com", "description": [{"lang": "en", "value": "CWE-476"}]}], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "Se encontr\u00f3 desreferencia de puntero nulo en upx, en la funci\u00f3n PackLinuxElf::canUnpack() en el archivo p_lx_elf.cpp, en versi\u00f3n UPX versi\u00f3n 4.0.0. Esto permite a atacantes ejecutar c\u00f3digo arbitrario y causar una denegaci\u00f3n de servicio por medio de un archivo dise\u00f1ado"}], "lastModified": "2025-04-11T12:27:55.013", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:upx:upx:4.0.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "82490EE3-906C-49A6-836B-1DB2E4457C7C"}], "operator": "OR"}]}, {"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "142AD0DD-4CF3-4D74-9442-459CE3347E3A"}], "operator": "OR"}]}, {"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E460AA51-FCDA-46B9-AE97-E6676AA5E194"}], "operator": "OR"}]}], "sourceIdentifier": "secalert@redhat.com"}