How severe is CVE-2020-12856?

CVE-2020-12856 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-12856 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-12856?

CVE-2020-12856 primarily affects Alberta Abtracetogether. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-12856?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2020-12856 published?

CVE-2020-12856 was published on 2020-05-18 and last updated on 2026-06-17.

CVE-2020-12856

CVE-2020-12856 is a critical-severity vulnerability in Alberta Abtracetogether with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 5% (91st percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Alberta Abtracetogether
Published: 2020-05-18
Last modified: 2026-06-17

Description

OpenTrace, as used in COVIDSafe through v1.0.17, TraceTogether, ABTraceTogether, and other applications on iOS and Android, allows remote attackers to conduct long-term re-identification attacks and possibly have unspecified other impact, because of how Bluetooth is used.

Frequently asked questions

What is CVE-2020-12856?: OpenTrace, as used in COVIDSafe through v1.0.17, TraceTogether, ABTraceTogether, and other applications on iOS and Android, allows remote attackers to conduct long-term re-identification attacks and possibly have unspecified other impact, because of how Bluetooth is used.
How severe is CVE-2020-12856?: CVE-2020-12856 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-12856 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-12856?: CVE-2020-12856 primarily affects Alberta Abtracetogether. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-12856?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2020-12856 published?: CVE-2020-12856 was published on 2020-05-18 and last updated on 2026-06-17.

References

Affected products (6)

cpe:2.3:a:alberta:abtracetogether:-:*:*:*:*:android:*:*
cpe:2.3:a:alberta:abtracetogether:-:*:*:*:*:iphone_os:*:*
cpe:2.3:a:health:covidsafe:*:*:*:*:*:android:*:*
cpe:2.3:a:health:covidsafe:-:*:*:*:*:iphone_os:*:*
cpe:2.3:a:tracetogether:tracetogether:-:*:*:*:*:android:*:*
cpe:2.3:a:tracetogether:tracetogether:-:*:*:*:*:iphone_os:*:*

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