CVE-2021-42374

lowpriority · track · 21EPSS 0.006 · 50 %ileDEEURUUS
grimoire priorityP3 · Track
Exploitable?
—
no known exploitation
Likely / severe?
0.62% (50th) EPSS
CVSS 3.3 · low
Is it mine?
71 products
Check your exposure
Who says so?
7 sources
cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-27

An out-of-bounds heap read in Busybox's unlzma applet leads to information leak and denial of service when crafted LZMA-compressed input is decompressed. This can be triggered by any applet/format that

01

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

02

cvss

Technical severity, 0–10. One row per scoring source.

6.5
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 3.3–6.5

v2.03.3lowAV:L/AC:M/Au:N/C:P/I:N/A:Pprimary · NVD / NIST USexploitability 3.4 · impact 4.9
v3.15.3mediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:Hprimary · NVD / NIST USexploitability 1 · impact 4.2
v3.16.5mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H/E:P/RL:O/RC:Csecondary · CISA US
v3.16.5mediumAV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:Hsecondary · FSTEC (BDU) RU
v3.15.3mediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:Hsecondary · ENISA EU
v3.15.3mediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:Hsecondaryexploitability 1 · impact 4.2
v3.16.5mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H/E:P/RL:O/RC:Csecondary · Siemens ProductCERT DE
v3.15.3mediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:Hsecondary · Phoenix Contact PSIRT DE
v3.14.9mediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)
03

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: poc · Automatable: no · Technical Impact: partialcoordinatorcisa_ssvcUS
04

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-125USprimaryCWE-125USCWE-125USCWE-125USCWE-125US
05

affected products (71)

Products and version ranges known to be affected.

showing 20 of 71
06

advisories (11)

Vendor and ecosystem advisories describing this.

  • SSA-419740SSA-419740: Multiple Third-Party Component Vulnerabilities in RUGGEDCOM and SCALANCE Products before V7.22023-03-14csaf · siemens_psirtDE

    Multiple third-party component vulnerabilities were reported for the Busybox applet, the Linux Kernel, OpenSSL, OpenVPN and various other components used by the RUGGEDCOM and SCALANCE products. The vulnerabilities range from improper neutralization of special elements to improper handling of commands under certain circumstances, that could lead to code injection and denial of service. Siemens has released updates for the affected products and recommends to update to the latest versions.

  • SSA-565386SSA-565386: Third-Party Component Vulnerabilities in SCALANCE W-700 IEEE 802.11ax devices before V2.02023-03-14csaf · siemens_psirtDE

    Multiple vulnerabilities affecting various third-party components of SCALANCE W-700 IEEE 802.11ax devices before V2.0 could allow an attacker to cause a denial of service condition, disclose sensitive data or violate the system integrity. Siemens has released an update for SCALANCE W-700 IEEE 802.11ax and recommends to update to the latest version.

  • SSA-831302SSA-831302: Vulnerabilities in the BIOS of the SIMATIC S7-1500 TM MFP before V1.3.02023-06-13csaf · siemens_psirtDE

    Multiple vulnerabilities have been identified in the BIOS of the SIMATIC S7-1500 TM MFP before V1.3.0. Siemens has released a new version for SIMATIC S7-1500 TM MFP - BIOS and recommends to update to the latest version.

  • SSA-942865SSA-942865: Multiple Vulnerabilities in the Integrated SCALANCE S615 of SINAMICS Medium Voltage Products2023-06-13csaf · siemens_psirtDE

    SINAMICS PERFECT HARMONY GH180 is affected by multiple vulnerabilities in the integrated SCALANCE S615 device, as documented in SSA-419740 ( https://cert-portal.siemens.com/productcert/html/ssa-419740.html). Siemens recommends to update the firmware of the integrated SCALANCE S615 device to the latest version. Siemens recommends specific countermeasures for products where the firmware update is not, or not yet applied. Additional considerations regarding the specific impact of the vulnerabilities to SINAMICS MV products can be found in the chapter "Additional Information".

  • VDE-2022-010PHOENIX CONTACT: Multiple Linux component vulnerabilities fixed in latest AXC F x152 LTS release2022-04-12csaf · phoenix_contact_psirtDE

    PLCnext Control AXC F x152 is certified according to IEC 62443-4-1 and IEC 62443-4-2. This certification requires that all third-party components used in the firmware are regularly checked for known vulnerabilities. Firmware components in version 2021.06 had already been updated. For the 2022.0 LTS version more firmware components have been updated implicitly fixing the vulnerabilities listed. The vulnerabilities listed above have not been individually verified in terms of actual impact and/or limitations in combination with the affected products listed. The current LTS release 2022.0 LTS contains updates of integrated third-party libraries, SDKs and other third-party software to address these issues nevertheless. UPDATE A (April 4th, 2022): Added RFC 4072 (Art. No. 1051328) and fixed affected version of AXC F 3152

  • WID-SEC-W-2022-2028BusyBox: Mehrere SchwachstellenDeutsch2021-11-09csaf · cert_bundDE

    Ein entfernter, anonymer oder authentisierter Angreifer kann mehrere Schwachstellen in BusyBox ausnutzen, um einen Denial of Service Angriff durchzuführen, Informationen offenzulegen oder beliebigen Code auszuführen.

  • WID-SEC-W-2023-1432Siemens SIMATIC S7: Mehrere SchwachstellenDeutsch2023-06-12csaf · cert_bundDE

    Ein Angreifer aus dem angrenzenden Netzwerk oder ein entfernter, anonymer, authentisierter, physischer oder lokaler Angreifer kann mehrere Schwachstellen in Siemens SIMATIC S7 ausnutzen, um beliebigen Code auszuführen, Sicherheitsmaßnahmen zu umgehen, vertrauliche Informationen offenzulegen, einen Denial-of-Service-Zustand herbeizuführen, seine Privilegien zu erweitern und Daten zu manipulieren.

  • ICSA-23-075-01Siemens SCALANCE, RUGGEDCOM Third-Party2023-03-14icsa · cisa_csaf_otUS

    Multiple third-party component vulnerabilities were reported for the Busybox applet, the Linux Kernel, OpenSSL, OpenVPN and various other components used by the RUGGEDCOM and SCALANCE products. The vulnerabilities range from improper neutralization of special elements to improper handling of commands under certain circumstances, that could lead to code injection and denial of service. Siemens has released updates for the affected products and recommends to update to the latest versions.

  • ICSA-23-080-07Siemens SCALANCE Third-Party2023-03-14icsa · cisa_csaf_otUS

    Multiple vulnerabilities affecting various third-party components of SCALANCE W-700 IEEE 802.11ax devices before V2.0 could allow an attacker to cause a denial of service condition, disclose sensitive data or violate the system integrity. Siemens has released an update for SCALANCE W-700 IEEE 802.11ax and recommends to update to the latest version.

  • ICSA-23-166-10Siemens SIMATIC S7-1500 TM MFP BIOS2023-06-13icsa · cisa_csaf_otUS

    Multiple vulnerabilities have been identified in the BIOS of the SIMATIC S7-1500 TM MFP before V1.3.0. Siemens has released a new version for SIMATIC S7-1500 TM MFP - BIOS and recommends to update to the latest version.

  • ICSA-23-166-12Siemens SINAMICS Medium Voltage Products2023-06-13icsa · cisa_csaf_otUS

    SINAMICS PERFECT HARMONY GH180 is affected by multiple vulnerabilities in the integrated SCALANCE S615 device, as documented in SSA-419740 ( https://cert-portal.siemens.com/productcert/html/ssa-419740.html). Siemens recommends to update the firmware of the integrated SCALANCE S615 device to the latest version. Siemens recommends specific countermeasures for products where the firmware update is not, or not yet applied. Additional considerations regarding the specific impact of the vulnerabilities to SINAMICS MV products can be found in the chapter "Additional Information".

07

also known as (4)

Other names and identifiers for this entity.

08

sources

Which sources assert this record, and when.

cnnvdenisa_euvdfstec_bducert_bundcisa_csaf_otsiemens_psirtphoenix_contact_psirtNVDCVE.orgMITRE
published 2021-11-15modified 2026-06-17
10

references (26)

External citations — patches, advisories, analysis.

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