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CVE-2020-4465· NVD / CVE Program· CNA ibm

IBM MQ, IBM MQ Appliance, and IBM MQ for HPE NonStop 8.0, 9.1 CD, and 9.1 LTS is vulnerable to a buffer overflow vulnerability due to an err

IBM MQ, IBM MQ Appliance, and IBM MQ for HPE NonStop 8.0, 9.1 CD, and 9.1 LTS is vulnerable to a buffer overflow vulnerability due to an error within the channel processing code. A remote attacker could overflow the buffer using an older client and cause a denial of service. IBM X-Force ID: 181562.

MediumCVSS 6.5 · v3.1—No exploit No fix recorded
Published
Jul 28, 2020
Updated
Jun 16, 2026
EPSS
1.9% · 79th percentile
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Report tools

JSON

Action score

27

Monitor

Low priority for now.

CVSS
26 / 40 · 6.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 1.9%

CNA vs NVD score

NVD
6.5
CNA · ibm
5.3
1.2 point gap

CVSS:3.0/S:U/PR:L/AC:H/C:N/A:H/AV:N/UI:N/I:N/RL:O/RC:C/E:U

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Noroxi analysis

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Affected systems

VendorProduct
ibmmq appliance

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • ibm mq appliance8.0 and later · before 8.0.0.15
  • ibm mq appliance9.1.0.0 and later · before 9.1.0.6
  • ibm mq appliance9.1.0.0 and later · before 9.2.0.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (ibm). Independent of NVD's CPE analysis and usually ahead of it.

  • IBM MQ Appliance

    • 8.0, 9.1.LTS, 9.1.CDaffected

Same product

ibm: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-10747IBM MQ Appliance is affected by a heap buffer overflow vulnerability in protocol message processing
    40Plan
  • CVE-2017-1318IBM MQ Appliance 8.0 and 9.0 could allow an authenticated messaging administrator to execute arbitrary commands on the system, caused by com
    36Monitor
  • CVE-2025-0975IBM MQ code execution
    35Monitor
  • CVE-2020-4938IBM MQ Appliance 9.1 and 9.2 is vulnerable to cross-site request forgery which could allow an attacker to execute malicious and unauthorized
    35Monitor
  • CVE-2023-46176IBM MQ privilege escalation
    31Monitor
  • CVE-2019-4620IBM MQ Appliance 8.0 and 9.0 LTS could allow a local attacker to bypass security restrictions caused by improper validation of environment v
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

The product’s vendor appears in a public program. Matched by name; verify the scope text in the program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-120 · Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Root cause

When data is copied, the source length is not compared with the size of the destination buffer. Excess data overwrites adjacent memory.

The bug in code

The whole CWE-120 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

c
char buf[256];memcpy(buf, pkt->data, pkt->len);

Fixed

c
char buf[256];if (pkt->len > sizeof(buf)) {  return -EINVAL;}memcpy(buf, pkt->data, pkt->len);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records