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CVE detail

CVE-2020-9054

Multiple ZyXEL network-attached storage (NAS) devices running firmware version 5.21 contain a pre-authentication command injection vulnerability, which may allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable device. ZyXEL NAS devices achieve authentication by using the weblogin.cgi CGI executable. This program fails to properly sanitize the username parameter that is passed to it. If the username parameter contains certain characters, it can allow command injection with the privileges of the web server that runs on the ZyXEL device. Although the web server does not run as the root user, ZyXEL devices include a setuid utility that can be leveraged to run any command with root privileges. As such, it should be assumed that exploitation of this vulnerability can lead to remote code execution with root privileges. By sending a specially-crafted HTTP POST or GET request to a vulnerable ZyXEL device, a remote, unauthenticated attacker may be able to execute arbitrary code on the device. This may happen by directly connecting to a device if it is directly exposed to an attacker. However, there are ways to trigger such crafted requests even if an attacker does not have direct connectivity to a vulnerable devices. For example, simply visiting a website can result in the compromise of any ZyXEL device that is reachable from the client system. Affected products include: NAS326 before firmware V5.21(AAZF.7)C0 NAS520 before firmware V5.21(AASZ.3)C0 NAS540 before firmware V5.21(AATB.4)C0 NAS542 before firmware V5.21(ABAG.4)C0 ZyXEL has made firmware updates available for NAS326, NAS520, NAS540, and NAS542 devices. Affected models that are end-of-support: NSA210, NSA220, NSA220+, NSA221, NSA310, NSA310S, NSA320, NSA320S, NSA325 and NSA325v2

CVSS 9.8 · CriticalBuzz score 65.2KEV listed

Buzz score

Why this CVE is surfacing

Buzz score total 65.2

This all-time snapshot uses the same composite formula as Trending across a 30-year evidence window, rather than a current rolling window.

Buzz score components · mention 25.6 · diversity 14.5 · KEV 25.0 · OTX 0.0 · PoC 0.0
Mention score
25.6
12 evidence mentions in the snapshot
Diversity score
14.5
5 sources across 2 categories
KEV score
25.0
Known exploited vulnerability present
OTX score
0.0
0 OTX pulses
PoC score
0.0
0 repos · best confidence N/A
Best PoC traction
0
Maximum stars on a matched PoC repo

Why it matters now

Mention timeline

Total mentions
0
within the 30d window
Peak daily
0
highest bucket

Evidence

Source links by recency

Newest mentions first
12 source links · newest first
  • Forescout experts questioned the attribution of cyber attacks that targeted the energy sector in Denmark in 2023 to the Russia-linked Sandworm. Forescout experts shared findings from their analysis of the cyber attacks that targeted the energy sector in Denmark in 2023, attributing them to the Russia-linked Sandworm. In May, Danish critical infrastructure faced the biggest […]

    newssecurityaffairs.comJan 14, 2024, 4:40 PM
  • A newly discovered Golang-based malware is using over 30 exploits in attacks, potentially putting millions of routers and Internet of Things (IoT) at risk of malware infection, according to a warning from AT&T Alien Labs.

    newswww.securityweek.comNov 12, 2021, 5:55 PM
  • Researchers at AT&T discovered a new BotenaGo botnet that is using thirty three exploits to target millions of routers and IoT devices. BotenaGo is a new botnet discovered by researchers at AT&T that leverages thirty three exploits to target millions of routers and IoT devices. Below is the list of exploits used by the bot: Vulnerability Affected devices […]

    newssecurityaffairs.comNov 12, 2021, 7:16 AM
  • A wide variety of Zyxel and LILIN IoT devices are being conscripted into several botnets, researchers have warned. Users are advised to implement the provided firmware updates to plug the security holes exploited by the botmasters or, if they can’t, to stop using the devices altogether or to put them behind network firewalls. Zyxel devices affected According to Palo Alto Networks’ Unit 42, botmasters using a new Mirai strain dubbed Mukashi are exploiting CVE-2020-9054, a … More →

    newswww.helpnetsecurity.comMar 23, 2020, 11:56 AM
  • A new variant of the infamous Mirai malware, tracked as Mukashi, targets Zyxel network-attached storage (NAS) devices exploiting recently patched CVE-2020-9054 issue. Security experts have discovered a new variant of the infamous Mirai malware, tracked as Mukashi, was employed in attacks against network-attached storage (NAS) devices manufactured by Zyxel. According to Palo Alto researchers, threat actors exploited […]

    newssecurityaffairs.comMar 21, 2020, 3:46 PM
  • A new variant of the notorious Mirai malware has been delivered by cybercriminals to network-attached storage (NAS) devices made by Zyxel through the exploitation of a recently patched vulnerability.

    newswww.securityweek.comMar 20, 2020, 7:47 PM
  • Unit 42 researchers discovered a new Mirai variant, dubbed Mukashi, exploiting CVE-2020-9054 to infect vulnerable versions of Zyxel network-attached storage (NAS) devices.

    vendorunit42.paloaltonetworks.comMar 19, 2020, 7:15 PM
  • Flaws Riddle Zyxel’s Network Management Software Experts have found tens of security vulnerabilities in Zyxel Network Management Software, including backdoors and hardcoded SSH keys. Security researchers Pierre Kim and Alexandre Torres have discovered several vulnerabilities Zyxel Cloud CNM SecuManager software that could expose users to cyber attacks. The Zyxel Cloud CNM SecuManager is a comprehensive […]

    newssecurityaffairs.comMar 12, 2020, 2:59 PM
  • March 2nd – Threat Intelligence BulletinCheck Point Research

    For the latest discoveries in cyber research for the week of March 2nd 2020, please download our Threat Intelligence Bulletin TOP ATTACKS AND BREACHES An unprotected ElasticSearch database belonging to the sport retailer Decathlon in Spain has been discovered, exposing over 123 million records of employee and customer data. The archive, over 9GB in size, […]

    vendorresearch.checkpoint.comMar 2, 2020, 10:30 AM
  • A recently disclosed zero-day vulnerability in Zyxel network-attached storage (NAS) devices also impacts over twenty of the vendor’s firewalls.

    newswww.securityweek.comFeb 27, 2020, 4:49 AM
  • Tech vendor Zyxel addresses a critical vulnerability in several network-attached storage (NAS) devices that is already being exploited in the wild. Zyxel has released security patches to address a critical remote code execution vulnerability, tracked as CVE-2020-9054, that affects several NAS devices. The flaw can be exploited by an unauthenticated attacker, it resides in the weblogin.cgi CGI executable […]

    newssecurityaffairs.comFeb 25, 2020, 8:25 PM
  • Networking devices vendor Zyxel has released patches for several network attached storage (NAS) devices to address a critical vulnerability that is already being exploited by cybercriminals.

    newswww.securityweek.comFeb 25, 2020, 3:43 PM

Exploit code

Public exploit repository references

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0 repository references · best confidence N/A · max 0 stars
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