How severe is CVE-2020-27687?

CVE-2020-27687 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-27687 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-27687?

CVE-2020-27687 affects Thingsboard. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-27687?

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.

When was CVE-2020-27687 published?

CVE-2020-27687 was published on 2020-12-18 and last updated on 2026-06-17.

CVE-2020-27687

CVE-2020-27687 is a high-severity vulnerability in Thingsboard with a CVSS 3.x base score of 8.8. 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-20.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.8
EPSS exploit prediction: 2% (72nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Thingsboard
Published: 2020-12-18
Last modified: 2026-06-17

Description

ThingsBoard before v3.2 is vulnerable to Host header injection in password-reset emails. This allows an attacker to send malicious links in password-reset emails to victims, pointing to an attacker-controlled server. Lack of validation of the Host header allows this to happen.

Frequently asked questions

What is CVE-2020-27687?: ThingsBoard before v3.2 is vulnerable to Host header injection in password-reset emails. This allows an attacker to send malicious links in password-reset emails to victims, pointing to an attacker-controlled server. Lack of validation of the Host header allows this to happen.
How severe is CVE-2020-27687?: CVE-2020-27687 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-27687 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-27687?: CVE-2020-27687 affects Thingsboard. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-27687?: 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.
When was CVE-2020-27687 published?: CVE-2020-27687 was published on 2020-12-18 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:thingsboard:thingsboard:*:*:*:*:*:*:*:*

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