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Fencer Vulns
high 7.3

CVE-2020-28895 json

integer overflow in calloc

published 2021-02-03 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-21286

cvss
7.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.5%
EPSS 1.5% chance of exploitation in 30 days, percentile 75%
public exploits
0
none known

Summary

In Wind River VxWorks, memory allocator has a possible overflow in calculating the memory block's size to be allocated by calloc(). As a result, the actual memory allocated is smaller than the buffer size specified by the arguments, leading to memory corruption.

Patch / fix

  • windriver vxworks 6.9.4.12

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-25-252-09 updated cvss 7.3

Rockwell Automation 1783-NATR

  • Rockwell Automation 1783-NATR <1.007
    affected: mitigation “Rockwell Automation released a product update addressing this vulnerability:” rockwellautomation.custhelp.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

cisa ICSA-25-155-02 updated cvss 7.3

Hitachi Energy Relion 670 650 series and SAM600-IO Product

  • Hitachi Energy Relion 650 >= 2.2.5.0, <= 2.2.5.1, >= 2.2.4.0, <= 2.2.4.2, >= 2.2.1.0, <= 2.2.1.7, >= 1.0, < 2.2.1 Hitachi Energy Relion 670 >= 2.2.5.0, <= 2.2.5.1, >= 2.2.4.0, <= 2.2.4.2, >= 2.2.3.0, <= 2.2.3.4, >= 2.2.2.0, <= 2.2.2.4
    affected: fixed in 2.2.5.2, mitigation
  • Hitachi Energy SAM-IO >= 2.2.5.0, <= 2.2.5.1, >= 2.2.1.0, <= 2.2.1.7
    affected: fixed in 2.2.5.2

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

cisa ICSA-23-103-13 updated cvss 7.3

Siemens SCALANCE Switch Families

  • Siemens SCALANCE X200-4P IRT (6GK5200-4AH00-2BA3) <V5.5.2 Siemens SCALANCE X201-3P IRT (6GK5201-3BH00-2BA3) <V5.5.2 Siemens SCALANCE X201-3P IRT PRO (6GK5201-3JR00-2BA6) <V5.5.2 Siemens SCALANCE X202-2IRT (6GK5202-2BB00-2BA3) <V5.5.2 Siemens SCALANCE X202-2IRT (6GK5202-2BB10-2BA3) <V5.5.2 Siemens SCALANCE X202-2P IRT (6GK5202-2BH00-2BA3) <V5.5.2
    +1 more products
    Siemens SCALANCE X202-2P IRT PRO (6GK5202-2JR00-2BA6) <V5.5.2
    affected: fixed in V5.5.2 support.industry.siemens.com
  • Siemens SCALANCE X204-2 (6GK5204-2BB10-2AA3) <V5.2.6 Siemens SCALANCE X204-2FM (6GK5204-2BB11-2AA3) <V5.2.6 Siemens SCALANCE X204-2LD (6GK5204-2BC10-2AA3) <V5.2.6 Siemens SCALANCE X204-2LD TS (6GK5204-2BC10-2CA2) <V5.2.6 Siemens SCALANCE X204-2TS (6GK5204-2BB10-2CA2) <V5.2.6
    affected: fixed in V5.2.6 support.industry.siemens.com
  • Siemens SCALANCE X204IRT (6GK5204-0BA00-2BA3) <V5.5.2 Siemens SCALANCE X204IRT (6GK5204-0BA10-2BA3) <V5.5.2 Siemens SCALANCE X204IRT PRO (6GK5204-0JA00-2BA6) <V5.5.2
    affected: fixed in V5.5.2 support.industry.siemens.com
  • Siemens SCALANCE X206-1 (6GK5206-1BB10-2AA3) <V5.2.6 Siemens SCALANCE X206-1LD (6GK5206-1BC10-2AA3) <V5.2.6 Siemens SCALANCE X208 (6GK5208-0BA10-2AA3) <V5.2.6 Siemens SCALANCE X208PRO (6GK5208-0HA10-2AA6) <V5.2.6 Siemens SCALANCE X212-2 (6GK5212-2BB00-2AA3) <V5.2.6 Siemens SCALANCE X212-2LD (6GK5212-2BC00-2AA3) <V5.2.6
    +2 more products
    Siemens SCALANCE X216 (6GK5216-0BA00-2AA3) <V5.2.6 Siemens SCALANCE X224 (6GK5224-0BA00-2AA3) <V5.2.6
    affected: fixed in V5.2.6 support.industry.siemens.com
  • Siemens SCALANCE X302-7 EEC (2x 24V, coated) (6GK5302-7GD00-2GA3) Siemens SCALANCE X302-7 EEC (2x 24V) (6GK5302-7GD00-2EA3) Siemens SCALANCE X302-7 EEC (2x 230V, coated) (6GK5302-7GD00-4GA3) Siemens SCALANCE X302-7 EEC (2x 230V) (6GK5302-7GD00-4EA3) Siemens SCALANCE X302-7 EEC (24V, coated) (6GK5302-7GD00-1GA3) Siemens SCALANCE X302-7 EEC (24V) (6GK5302-7GD00-1EA3)
    +11 more products
    Siemens SCALANCE X302-7 EEC (230V, coated) (6GK5302-7GD00-3GA3) Siemens SCALANCE X302-7 EEC (230V) (6GK5302-7GD00-3EA3) Siemens SCALANCE X304-2FE (6GK5304-2BD00-2AA3) Siemens SCALANCE X306-1LD FE (6GK5306-1BF00-2AA3) Siemens SCALANCE X307-2 EEC (2x 24V, coated) (6GK5307-2FD00-2GA3) Siemens SCALANCE X307-2 EEC (2x 24V) (6GK5307-2FD00-2EA3) Siemens SCALANCE X307-2 EEC (2x 230V, coated) (6GK5307-2FD00-4GA3) Siemens SCALANCE X307-2 EEC (2x 230V) (6GK5307-2FD00-4EA3) Siemens SCALANCE X307-2 EEC (24V, coated) (6GK5307-2FD00-1GA3) Siemens SCALANCE X307-2 EEC (24V) (6GK5307-2FD00-1EA3) Siemens SCALANCE X307-2 EEC (230V, coated) (6GK5307-2FD00-3GA3)
    affected: no fix planned

67 more affected in the full advisory

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

cisa ICSA-21-119-04 updated cvss 7.3

Multiple RTOS (Update E)

  • multiple Amazon FreeRTOS 10.4.1 multiple Apache Nuttx OS 9.1.0 multiple ARM CMSIS-RTOS2 < 2.1.3 multiple ARM Mbed OS 6.3.0 multiple ARM mbed-ualloc 1.3.0 multiple BlackBerry QNX OS for Medical <= 1.1
    +22 more products
    multiple BlackBerry QNX OS for Safety <= 1.0.1 multiple BlackBerry QNX SDP <= 6.5.0 SP1 multiple Cesanta Software Mongoose OS 2.17.0 multiple eCosCentric eCosPro RTOS >= 2.0.1, <= 4.5.3 multiple Google Cloud IoT Device SDK 1.0.2 multiple Media Tek LinkIt SDK < 4.6.1 multiple Micrium OS <= 5.10.1 multiple Micrium uC/OS 1.38.xx, 1.39.00 multiple NXP MCUXpresso SDK < 2.8.2 multiple NXP MQX <= 5.1 multiple Redhat newlib < 4.0.0 multiple RIOT OS 2020.01.1 multiple Samsung Tizen RT RTOS < 3.0.GBB multiple TencentOS-tiny 3.1.0 multiple Texas Instruments CC32XX < 4.40.00.07 multiple Texas Instruments SimpleLink MSP432E4XX multiple Texas Instruments SimpleLink-CC13XX < 4.40.00 multiple Texas Instruments SimpleLink-CC26XX < 4.40.00 multiple Texas Instruments SimpleLink-CC32XX < 4.10.03 multiple Uclibc-NG < 1.0.36 multiple Windriver VxWorks < 7.0 multiple Zephyr Project RTOS < 2.5
    affected: mitigation “Hitachi Energy GMS600 - See public advisory.” search.abb.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Exploit prediction

1.54% chance of exploitation in the next 30 days, higher than 75% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
NVD 3.1 7.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.