How severe is CVE-2021-37847?

CVE-2021-37847 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-37847 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-2021-37847?

CVE-2021-37847 affects Pengutronix Barebox. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-37847?

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-2021-37847 published?

CVE-2021-37847 was published on 2021-08-02 and last updated on 2026-06-17.

CVE-2021-37847

CVE-2021-37847 is a high-severity vulnerability in Pengutronix Barebox with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (72nd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Pengutronix Barebox
Published: 2021-08-02
Last modified: 2026-06-17

Description

crypto/digest.c in Pengutronix barebox through 2021.07.0 leaks timing information because memcmp is used during digest verification.

Frequently asked questions

What is CVE-2021-37847?: crypto/digest.c in Pengutronix barebox through 2021.07.0 leaks timing information because memcmp is used during digest verification.
How severe is CVE-2021-37847?: CVE-2021-37847 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-37847 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-2021-37847?: CVE-2021-37847 affects Pengutronix Barebox. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-37847?: 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-2021-37847 published?: CVE-2021-37847 was published on 2021-08-02 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:pengutronix:barebox:*:*:*:*:*:*:*:*

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