CVE-2020-13656: In Morgan Stanley Hobbes through 2020-05-21, the array implementation lacks bounds checking, allowing exploita

Q: How do I fix CVE-2020-13656?

hobbes: upgrade to newer than 2020-05-21. Exact commands for each OS are on this page.

Q: Is CVE-2020-13656 being exploited?

CVE-2020-13656 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2020-13656 affect?

CVE-2020-13656 affects hobbes. Severity is critical (CVSS 9.8). 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.

Q: How urgent is CVE-2020-13656?

Priority 65/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2020-13656 is a critical-severity flaw (CVSS 9.8) affecting hobbes. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.1% (top 18%)
CISA exploited list	No
Weakness	CWE-125, CWE-787
Published	2020-06-12
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: morganstanley

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2020-06-12 23:15 UTCPublished CVE record published
2026-06-17 02:53 UTCUpdated Record last modified

morganstanley hobbes UPGRADE

Affected: <= 2020-05-21

Fixed in: newer than 2020-05-21

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy hobbes || rpm -q hobbes || hobbes --version

2. UPGRADE to newer than 2020-05-21 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade hobbes

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade hobbes

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-13656?

hobbes: upgrade to newer than 2020-05-21. Exact commands for each OS are on this page.

Is CVE-2020-13656 being exploited?

CVE-2020-13656 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-13656 affect?

CVE-2020-13656 affects hobbes. Severity is critical (CVSS 9.8). 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 urgent is CVE-2020-13656?

Priority 65/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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