How severe is CVE-2020-13656?

CVE-2020-13656 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-2020-13656 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-13656?

CVE-2020-13656 affects Morganstanley Hobbes. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-13656?

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-2020-13656 published?

CVE-2020-13656 was published on 2020-06-12 and last updated on 2026-06-17.

CVE-2020-13656

CVE-2020-13656 is a critical-severity vulnerability in Morganstanley Hobbes 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. The underlying weakness is classified as CWE-125.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (80th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-125
Affected product: Morganstanley Hobbes
Published: 2020-06-12
Last modified: 2026-06-17

Description

In Morgan Stanley Hobbes through 2020-05-21, the array implementation lacks bounds checking, allowing exploitation of an out-of-bounds (OOB) read/write vulnerability that leads to both local and remote code (via RPC) execution.

Frequently asked questions

What is CVE-2020-13656?: In Morgan Stanley Hobbes through 2020-05-21, the array implementation lacks bounds checking, allowing exploitation of an out-of-bounds (OOB) read/write vulnerability that leads to both local and remote code (via RPC) execution.
How severe is CVE-2020-13656?: CVE-2020-13656 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-2020-13656 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-13656?: CVE-2020-13656 affects Morganstanley Hobbes. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-13656?: 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-2020-13656 published?: CVE-2020-13656 was published on 2020-06-12 and last updated on 2026-06-17.

References

https://know.bishopfox.com/advisories/oob-to-rce-exploitation-of-the-hobbes-functional-interpreter

Affected products (1)

cpe:2.3:a:morganstanley:hobbes:*:*:*:*:*:*:*:*

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