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CVE-2021-27504· NVD / CVE Program· CNA icscert

Texas Instruments FREERTOS Integer Overflow or Wraparound

Texas Instruments devices running FREERTOS, malloc returns a valid pointer to a small buffer on extremely large values, which can trigger an integer overflow vulnerability in 'malloc' for FreeRTOS, resulting in code execution.

HighCVSS 7.8 · v3.1—No exploit No fix recorded
Published
Nov 21, 2023
Updated
Jun 16, 2026
EPSS
0.3% · 18th percentile
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Report tools

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Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

CNA vs NVD score

NVD
7.8
CNA · icscert
7.4
0.4 point gap

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

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

Noroxi analysis

No Noroxi analysis for this record yet

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Affected systems

VendorProduct
amazonfreertos
tisimplelink cc13xx software development kit
tisimplelink cc26xx software development kit
tisimplelink cc32xx software development kit
tisimplelink msp432e401y
tisimplelink msp432e411y

Affected versions

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

  • amazon freertos10.4.1
  • ti simplelink cc13xx software development kitbefore 4.40.00
  • ti simplelink cc26xx software development kitbefore 4.40.00
  • ti simplelink cc32xx software development kitbefore 4.10.03
  • ti simplelink msp432e401yall versions
  • ti simplelink msp432e411yall versions

Versions reported by the vendor

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

  • Texas Instruments CC32XX

    • before 4.40.00.07affected

  • Texas Instruments SimpleLink MSP432E4XX

    • all versionsaffected

  • Texas Instruments SimpleLink-CC13XX

    • before 4.40.00affected

  • Texas Instruments SimpleLink-CC26XX

    • before 4.40.00affected

  • Texas Instruments SimpleLink-CC32XX

    • before 4.10.03affected

Same product

amazon: all records

Other highest-scoring records for the same primary product.

  • CVE-2021-32020The kernel in Amazon Web Services FreeRTOS before 10.4.3 has insufficient bounds checking during management of heap memory.
    39Monitor
  • CVE-2021-31572The kernel in Amazon Web Services FreeRTOS before 10.4.3 has an integer overflow in stream_buffer.c for a stream buffer.
    39Monitor
  • CVE-2021-31571The kernel in Amazon Web Services FreeRTOS before 10.4.3 has an integer overflow in queue.c for queue creation.
    39Monitor
  • CVE-2026-77234Improper input validation in FreeRTOS-Kernel timer command handling
    37Monitor
  • CVE-2026-77236Missing size validation in SecureContext_AllocateContext in FreeRTOS-Kernel
    33Monitor
  • CVE-2026-77235Missing privilege check in SecureContext_FreeContext in FreeRTOS-Kernel
    33Monitor

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.

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

  • Someone with local access to the system 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
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-190 · Integer Overflow or Wraparound

CVSS vector

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

nvd-primary

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