Explain the vulnerability: CVE-2021-22811
Description:A CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability exists that could cause script execution when the request of a privileged account accessing the vulnerable web page is intercepted. Affected Products: 1-Phase Uninterruptible Power Supply (UPS) using NMC2 including Smart-UPS, Symmetra, and Galaxy 3500 with Network Management Card 2 (NMC2): AP9630/AP9630CH/AP9630J, AP9631/AP9631CH/AP9631J, AP9635/AP9635J (NMC2 AOS V6.9.8 and earlier), 3-Phase Uninterruptible Power Supply (UPS) using NMC2 including Symmetra PX 250/500 (SYPX) Network Management Card 2 (NMC2): AP9630/AP9630CH/AP9630J, AP9631/AP9631CH/AP9631J, AP9635/AP9635J (NMC2 AOS V6.9.6 and earlier), 3-Phase Uninterruptible Power Supply (UPS) using NMC2 including Symmetra PX 48/96/100/160 kW UPS (PX2), Symmetra PX 20/40 kW UPS (SY3P), Gutor (SXW, GVX), and Galaxy (GVMTS, GVMSA, GVXTS, GVXSA, G7K, GFC, G9KCHU): AP9630/AP9630CH/AP9630J, AP9631/AP9631CH/AP9631J, AP9635/AP9635CH (NMC2 AOS V6.9.6 and earlier), 1-Phase Uninterruptible Power Supply (UPS) using NMC3 including Smart-UPS, Symmetra, and Galaxy 3500 with Network Management Card 3 (NMC3): AP9640/AP9640J, AP9641/AP9641J, AP9643/AP9643J (NMC3 AOS V1.4.2.1 and earlier), APC Rack Power Distribution Units (PDU) using NMC2 2G Metered/Switched Rack PDUs with embedded NMC2: AP84XX, AP86XX, AP88XX, AP89XX (NMC2 AOS V6.9.6 and earlier), APC Rack Power Distribution Units (PDU) using NMC3 2G Metered/Switched Rack PDUs with embedded NMC3: APDU99xx (NMC3 AOS V1.4.0 and earlier), APC 3-Phase Power Distribution Products using NMC2 Galaxy RPP: GRPPIP2X84 (NMC2 AOS V6.9.6 and earlier), Network Management Card 2 (NMC2) for InfraStruxure 150 kVA PDU with 84 Poles (X84P): PDPB150G6F (NMC2 AOS V6.9.6 and earlier), Network Management Card 2 for InfraStruxure 40/60kVA PDU (XPDU) PD40G6FK1-M, PD40F6FK1-M, PD40L6FK1-M, PDRPPNX10 M,PD60G6FK1, PD60F6FK1, PD60L6FK1, PDRPPNX10, PD40E5EK20-M, PD40H5EK20-M (NMC2 AOS V6.9.6 and earlier), Network Management Card 2 for Modular 150/175kVA PDU (XRDP): PDPM150G6F, PDPM150L6F, PDPM175G6H (NMC2 AOS V6.9.6 and earlier), Network Management Card 2 for 400 and 500 kVA (PMM): PMM400-ALA, PMM400-ALAX, PMM400-CUB, PMM500-ALA, PMM500-ALAX, PMM500-CUB (NMC2 AOS V6.9.6 and earlier), Network Management Card 2 for Modular PDU (XRDP2G): PDPM72F-5U, PDPM138H-5U, PDPM144F, PDPM138H-R, PDPM277H, PDPM288G6H (NMC2 AOS V6.9.6 and earlier), Rack Automatic Transfer Switches (ATS) Embedded NMC2: Rack Automatic Transfer Switches - AP44XX (ATS4G) (NMC2 AOS V6.9.6 and earlier), Network Management Card 2 (NMC2) Cooling Products: InRow Cooling for series ACRP5xx, ACRP1xx, ACRD5xx, and ACRC5xx SKUs (ACRP2G), InRow Cooling for series ACRC10x SKUs (RC10X2G), InRow Cooling for series ACRD6xx and ACRC6xx SKUs (ACRD2G), InRow Cooling Display for series ACRD3xx (ACRC2G), InRow Cooling for series ACSC1xx SKUs (SC2G), InRow Cooling for series ACRD1xx and ACRD2xx (ACRPTK2G), Ecoflair IAEC25/50 Air Economizer Display (EB2G), Uniflair SP UCF0481I, UCF0341I (UNFLRSP), Uniflair LE DX Perimeter Cooling Display for SKUs: IDAV, IDEV, IDWV, IUAV, IUEV, IUWV, IXAV, IXEV, IXWV, LDAV, LDEV, and LDWV (LEDX2G), Refrigerant Distribution Unit: ACDA9xx (RDU) (NMC2 AOS V6.9.6 and earlier), Environmental Monitoring Unit with embedded NMC2 (NB250): NetBotz NBRK0250 (NMC2 AOS V6.9.6 and earlier), and Network Management Card 2 (NMC2): AP9922 Battery Management System (BM4) (NMC2 AOS V6.9.6 and earlier)