How severe is CVE-2018-15560?

CVE-2018-15560 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 none, and availability high.

Is CVE-2018-15560 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-15560?

CVE-2018-15560 affects Pycryptodome. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-15560?

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-2018-15560 published?

CVE-2018-15560 was published on 2018-08-20 and last updated on 2026-06-17.

CVE-2018-15560

CVE-2018-15560 is a high-severity vulnerability in Pycryptodome 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-190.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (75th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-190
Affected product: Pycryptodome
Published: 2018-08-20
Last modified: 2026-06-17

Description

PyCryptodome before 3.6.6 has an integer overflow in the data_len variable in AESNI.c, related to the AESNI_encrypt and AESNI_decrypt functions, leading to the mishandling of messages shorter than 16 bytes.

Frequently asked questions

What is CVE-2018-15560?: PyCryptodome before 3.6.6 has an integer overflow in the data_len variable in AESNI.c, related to the AESNI_encrypt and AESNI_decrypt functions, leading to the mishandling of messages shorter than 16 bytes.
How severe is CVE-2018-15560?: CVE-2018-15560 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 none, and availability high.
Is CVE-2018-15560 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-15560?: CVE-2018-15560 affects Pycryptodome. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-15560?: 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-2018-15560 published?: CVE-2018-15560 was published on 2018-08-20 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:pycryptodome:pycryptodome:*:*:*:*:*:*:*:*

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