CVE-2026-1803
CVE-2026-1803 is a high-severity vulnerability with a CVSS 3.x base score of 8.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-1392.
Key facts
- Severity: High (CVSS 3.x base score 8.1)
- CVSS v2: 7.6
- CVSS v4: 8.2
- EPSS exploit prediction: 1% (45th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-5180
- Weakness: CWE-1392
- Published:
- Last modified:
Description
A weakness has been identified in Ziroom ZHOME A0101 1.0.1.0. Impacted is an unknown function of the component Dropbear SSH Service. This manipulation causes use of default credentials. Remote exploitation of the attack is possible. The complexity of an attack is rather high. The exploitability is considered difficult. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.
Frequently asked questions
- What is CVE-2026-1803?
- A weakness has been identified in Ziroom ZHOME A0101 1.0.1.0. Impacted is an unknown function of the component Dropbear SSH Service. This manipulation causes use of default credentials. Remote exploitation of the attack is possible. The complexity of an attack is rather high. The exploitability is considered difficult. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.
- How severe is CVE-2026-1803?
- CVE-2026-1803 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2026-1803 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2026-1803?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- Does CVE-2026-1803 have an EU (EUVD) identifier?
- Yes. CVE-2026-1803 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-5180.
- When was CVE-2026-1803 published?
- CVE-2026-1803 was published on 2026-02-03 and last updated on 2026-06-17.
References
- https://github.com/Blackhole23-Lab/-/blob/main/vulns/ssh-backdoor.md
- https://github.com/Blackhole23-Lab/-/blob/main/vulns/ssh-backdoor.md#proof-of-concept
- https://vuldb.com/?ctiid.343976
- https://vuldb.com/?id.343976
- https://vuldb.com/?submit.745497
- https://vuldb.com/?submit.745529
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