How severe is CVE-2017-12972?

CVE-2017-12972 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 none, integrity high, and availability none.

Is CVE-2017-12972 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-12972?

CVE-2017-12972 primarily affects Connect2id Nimbus Jose+jwt. In total, 127 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2017-12972?

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-2017-12972 published?

CVE-2017-12972 was published on 2017-08-20 and last updated on 2026-06-17.

CVE-2017-12972

CVE-2017-12972 is a high-severity vulnerability in Connect2id Nimbus Jose+jwt 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. The underlying weakness is classified as CWE-345.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (55th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-345
Affected product: Connect2id Nimbus Jose+jwt
Published: 2017-08-20
Last modified: 2026-06-17

Description

In Nimbus JOSE+JWT before 4.39, there is no integer-overflow check when converting length values from bytes to bits, which allows attackers to conduct HMAC bypass attacks by shifting Additional Authenticated Data (AAD) and ciphertext so that different plaintext is obtained for the same HMAC.

Frequently asked questions

What is CVE-2017-12972?: In Nimbus JOSE+JWT before 4.39, there is no integer-overflow check when converting length values from bytes to bits, which allows attackers to conduct HMAC bypass attacks by shifting Additional Authenticated Data (AAD) and ciphertext so that different plaintext is obtained for the same HMAC.
How severe is CVE-2017-12972?: CVE-2017-12972 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 none, integrity high, and availability none.
Is CVE-2017-12972 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-12972?: CVE-2017-12972 primarily affects Connect2id Nimbus Jose+jwt. In total, 127 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2017-12972?: 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-2017-12972 published?: CVE-2017-12972 was published on 2017-08-20 and last updated on 2026-06-17.

References

Affected products (127)

cpe:2.3:a:connect2id:nimbus_jose\+jwt:1.0:*:*:*:*:*:*:*
cpe:2.3:a:connect2id:nimbus_jose\+jwt:1.1:*:*:*:*:*:*:*
cpe:2.3:a:connect2id:nimbus_jose\+jwt:1.2:*:*:*:*:*:*:*
cpe:2.3:a:connect2id:nimbus_jose\+jwt:1.3:*:*:*:*:*:*:*
cpe:2.3:a:connect2id:nimbus_jose\+jwt:1.4:*:*:*:*:*:*:*
cpe:2.3:a:connect2id:nimbus_jose\+jwt:1.5:*:*:*:*:*:*:*
cpe:2.3:a:connect2id:nimbus_jose\+jwt:1.6:*:*:*:*:*:*:*
cpe:2.3:a:connect2id:nimbus_jose\+jwt:1.7:*:*:*:*:*:*:*
cpe:2.3:a:connect2id:nimbus_jose\+jwt:1.8:*:*:*:*:*:*:*
cpe:2.3:a:connect2id:nimbus_jose\+jwt:1.9:*:*:*:*:*:*:*
cpe:2.3:a:connect2id:nimbus_jose\+jwt:1.9.1:*:*:*:*:*:*:*
cpe:2.3:a:connect2id:nimbus_jose\+jwt:1.10:*:*:*:*:*:*:*
cpe:2.3:a:connect2id:nimbus_jose\+jwt:1.11:*:*:*:*:*:*:*
cpe:2.3:a:connect2id:nimbus_jose\+jwt:1.12:*:*:*:*:*:*:*
cpe:2.3:a:connect2id:nimbus_jose\+jwt:2.0:*:*:*:*:*:*:*
cpe:2.3:a:connect2id:nimbus_jose\+jwt:2.0.1:*:*:*:*:*:*:*
cpe:2.3:a:connect2id:nimbus_jose\+jwt:2.1:*:*:*:*:*:*:*
cpe:2.3:a:connect2id:nimbus_jose\+jwt:2.1.1:*:*:*:*:*:*:*
cpe:2.3:a:connect2id:nimbus_jose\+jwt:2.2:*:*:*:*:*:*:*
cpe:2.3:a:connect2id:nimbus_jose\+jwt:2.3:*:*:*:*:*:*:*
cpe:2.3:a:connect2id:nimbus_jose\+jwt:2.4:*:*:*:*:*:*:*
cpe:2.3:a:connect2id:nimbus_jose\+jwt:2.5:*:*:*:*:*:*:*
cpe:2.3:a:connect2id:nimbus_jose\+jwt:2.6:*:*:*:*:*:*:*
cpe:2.3:a:connect2id:nimbus_jose\+jwt:2.7:*:*:*:*:*:*:*
cpe:2.3:a:connect2id:nimbus_jose\+jwt:2.8:*:*:*:*:*:*:*
cpe:2.3:a:connect2id:nimbus_jose\+jwt:2.9:*:*:*:*:*:*:*
cpe:2.3:a:connect2id:nimbus_jose\+jwt:2.10:*:*:*:*:*:*:*
cpe:2.3:a:connect2id:nimbus_jose\+jwt:2.10.1:*:*:*:*:*:*:*
cpe:2.3:a:connect2id:nimbus_jose\+jwt:2.11.0:*:*:*:*:*:*:*
cpe:2.3:a:connect2id:nimbus_jose\+jwt:2.12.0:*:*:*:*:*:*:*
cpe:2.3:a:connect2id:nimbus_jose\+jwt:2.13.0:*:*:*:*:*:*:*
cpe:2.3:a:connect2id:nimbus_jose\+jwt:2.13.1:*:*:*:*:*:*:*
cpe:2.3:a:connect2id:nimbus_jose\+jwt:2.14:*:*:*:*:*:*:*
cpe:2.3:a:connect2id:nimbus_jose\+jwt:2.15:*:*:*:*:*:*:*
cpe:2.3:a:connect2id:nimbus_jose\+jwt:2.15.1:*:*:*:*:*:*:*
cpe:2.3:a:connect2id:nimbus_jose\+jwt:2.15.2:*:*:*:*:*:*:*
cpe:2.3:a:connect2id:nimbus_jose\+jwt:2.16:*:*:*:*:*:*:*
cpe:2.3:a:connect2id:nimbus_jose\+jwt:2.17:*:*:*:*:*:*:*
cpe:2.3:a:connect2id:nimbus_jose\+jwt:2.17.1:*:*:*:*:*:*:*
cpe:2.3:a:connect2id:nimbus_jose\+jwt:2.17.2:*:*:*:*:*:*:*

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