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CVE-2026-41503 (GCVE-0-2026-41503)

Vulnerability from nvd – Published: 2026-04-24 19:41 – Updated: 2026-04-27 13:39

Title

BACnet Stack: Out-of-Bounds Read in ReadPropertyMultiple Property Decoder via Deprecated Tag Parser

Summary

BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to 1.4.3, an out-of-bounds read vulnerability in bacnet-stack's ReadPropertyMultiple service property decoder allows unauthenticated remote attackers to read past allocated buffer boundaries by sending an RPM request with a truncated property list. The vulnerability stems from rpm_decode_object_property() calling the deprecated decode_tag_number_and_value() function at src/bacnet/rpm.c:344, which accepts no buffer length parameter and reads blindly from whatever pointer it receives. A crafted BACnet/IP packet with a 1-byte property payload containing an extended tag marker (0xF9) causes the decoder to read 1 byte past the end of the buffer, leading to crashes on embedded BACnet devices. The vulnerability exists in src/bacnet/rpm.c and affects any deployment that enables the ReadPropertyMultiple confirmed service handler (enabled by default in the reference server). This vulnerability is fixed in 1.4.3.

Severity

8.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-125 - Out-of-bounds Read

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/bacnet-stack/bacnet-stack/secu…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
bacnet-stack	bacnet-stack	Affected: >= 1.4.0, < 1.4.3

Show details on NVD website

JSON

To clipboard

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CVE-2026-41502 (GCVE-0-2026-41502)

Vulnerability from nvd – Published: 2026-04-24 19:40 – Updated: 2026-04-25 01:53

Title

BACnet Stack: Off-by-One Out-of-Bounds Read in ReadPropertyMultiple Object ID Decoder

Summary

BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to 1.4.3, an off-by-one out-of-bounds read vulnerability in bacnet-stack's ReadPropertyMultiple service decoder allows unauthenticated remote attackers to read one byte past an allocated buffer boundary by sending a crafted RPM request with a truncated object identifier. The vulnerability is in rpm_decode_object_id(), which checks apdu_len < 5 but then accesses all 6 byte positions (indices 0-5) — consuming 1 byte for the context tag, 4 bytes for the object ID, then reading apdu[5] for the opening tag check. A 5-byte input passes the length check but causes a 1-byte OOB read, leading to crashes on embedded BACnet devices. The vulnerability exists in src/bacnet/rpm.c and affects any deployment that enables the ReadPropertyMultiple confirmed service handler (enabled by default in the reference server). This vulnerability is fixed in 1.4.3.

Severity

8.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-125 - Out-of-bounds Read
CWE-193 - Off-by-one Error

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/bacnet-stack/bacnet-stack/secu…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
bacnet-stack	bacnet-stack	Affected: >= 1.4.0, < 1.4.3

Show details on NVD website

JSON

To clipboard

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CVE-2026-41475 (GCVE-0-2026-41475)

Vulnerability from nvd – Published: 2026-04-24 19:39 – Updated: 2026-04-27 13:41

Title

BACnet Stack: Out-of-Bounds Read in WritePropertyMultiple Decoder via Deprecated Tag Parser

Summary

BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to 1.4.3, an out-of-bounds read vulnerability in bacnet-stack's WritePropertyMultiple service decoder allows unauthenticated remote attackers to read past allocated buffer boundaries by sending a truncated WPM request. The vulnerability stems from wpm_decode_object_property() calling the deprecated decode_tag_number_and_value() function, which performs no bounds checking on the input buffer. A crafted BACnet/IP packet with a truncated property payload causes the decoder to read 1-7 bytes past the end of the buffer, leading to crashes or information disclosure on embedded BACnet devices. This vulnerability is fixed in 1.4.3.

Severity

8.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-125 - Out-of-bounds Read

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/bacnet-stack/bacnet-stack/secu…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
bacnet-stack	bacnet-stack	Affected: >= 1.4.0, < 1.4.3

Show details on NVD website

JSON

To clipboard

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CVE-2026-40279 (GCVE-0-2026-40279)

Vulnerability from nvd – Published: 2026-04-21 16:29 – Updated: 2026-04-21 19:18

Title

BACnet Stack: Undefined-behavior signed left shift in `decode_signed32()`

Summary

BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to 1.4.3, decode_signed32() in src/bacnet/bacint.c reconstructs a 32-bit signed integer from four APDU bytes using signed left shifts. When any of the four bytes has bit 7 set (value ≥ 0x80), the left-shift operation overflows a signed int32_t, which is undefined behavior per the C standard. This is flagged thousands of times per minute by UndefinedBehaviorSanitizer on any BACnet input containing signed-integer property values with high-bit-set bytes. This vulnerability is fixed in 1.4.3.

Severity

3.7 (Low)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-758 - Reliance on Undefined, Unspecified, or Implementation-Defined Behavior

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/bacnet-stack/bacnet-stack/secu…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
bacnet-stack	bacnet-stack	Affected: < 1.4.3

Show details on NVD website

JSON

To clipboard

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        }
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      "source": {
        "advisory": "GHSA-326g-j95f-gmxv",
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      },
      "title": "BACnet Stack: Undefined-behavior signed left shift in `decode_signed32()`"
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CVE-2026-26264 (GCVE-0-2026-26264)

Vulnerability from nvd – Published: 2026-02-13 18:14 – Updated: 2026-02-13 18:50

Title

BACnet Stack WriteProperty decoding length underflow leads to OOB read and crash

Summary

BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to 1.5.0rc4 and 1.4.3rc2, a malformed WriteProperty request can trigger a length underflow in the BACnet stack, leading to an out‑of‑bounds read and a crash (DoS). The issue is in wp.c within wp_decode_service_request. When decoding the optional priority context tag, the code passes apdu_len - apdu_size to bacnet_unsigned_context_decode without validating that apdu_size <= apdu_len. If a truncated APDU reaches this path, apdu_len - apdu_size underflows, resulting in a large size being used for decoding and an out‑of‑bounds read. This vulnerability is fixed in 1.5.0rc4 and 1.4.3rc2.

Severity

7.8 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N/E:P

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-125 - Out-of-bounds Read

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/bacnet-stack/bacnet-stack/secu…	x_refsource_CONFIRM
https://github.com/bacnet-stack/bacnet-stack/comm…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
bacnet-stack	bacnet-stack	Affected: >= 1.5.0rc1, < 1.5.0rc4 Affected: < 1.4.3rc2

Show details on NVD website

JSON

To clipboard

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CVE-2026-21878 (GCVE-0-2026-21878)

Vulnerability from nvd – Published: 2026-02-13 18:10 – Updated: 2026-02-13 18:53

Title

BACnet Stack Improperly Limits Pathnames to a Restricted Directory

Summary

BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to 1.5.0.rc3, a vulnerability has been discovered in BACnet Stack's file writing functionality where there is no validation of user-provided file paths, allowing attackers to write files to arbitrary directories. This affects apps/readfile/main.c and ports/posix/bacfile-posix.c. This vulnerability is fixed in 1.5.0.rc3.

Severity

7.5 (High)


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

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/bacnet-stack/bacnet-stack/secu…	x_refsource_CONFIRM
https://github.com/bacnet-stack/bacnet-stack/comm…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
bacnet-stack	bacnet-stack	Affected: < 1.5.0.rc3

Show details on NVD website

JSON

To clipboard

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CVE-2026-21870 (GCVE-0-2026-21870)

Vulnerability from nvd – Published: 2026-02-13 17:58 – Updated: 2026-02-13 18:19

Title

The BACnet Protocol Stack library has an Off-by-one Stack-based Buffer Overflow in tokenizer_string

Summary

BACnet Protocol Stack library provides a BACnet application layer, network layer and media access (MAC) layer communications services. In 1.4.2, 1.5.0.rc2, and earlier, an off-by-one stack-based buffer overflow in the ubasic interpreter causes a crash (SIGABRT) when processing string literals longer than the buffer limit. The tokenizer_string function in src/bacnet/basic/program/ubasic/tokenizer.c incorrectly handles null termination for maximum-length strings. It writes a null byte to dest[40] when the buffer size is only 40 (indices 0-39), triggering a stack overflow.

Severity

5.5 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-193 - Off-by-one Error

Assigner

GitHub_M

References

3 references

URL	Tags
https://github.com/bacnet-stack/bacnet-stack/secu…	x_refsource_CONFIRM
https://github.com/bacnet-stack/bacnet-stack/pull/1196	x_refsource_MISC
https://github.com/bacnet-stack/bacnet-stack/comm…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
bacnet-stack	bacnet-stack	Affected: <= 1.4.2 Affected: >= 1.5.0.rc1, <= 1.5.0.rc2

Show details on NVD website

JSON

To clipboard

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CVE-2025-66624 (GCVE-0-2025-66624)

Vulnerability from nvd – Published: 2025-12-05 18:36 – Updated: 2025-12-08 17:28

Title

BACnet-stack MS/TP reply matcher OOB read

Summary

BACnet Protocol Stack library provides a BACnet application layer, network layer and media access (MAC) layer communications services. Prior to 1.5.0.rc2, The npdu_is_expected_reply function in src/bacnet/npdu.c indexes request_pdu[offset+2/3/5] and reply_pdu[offset+1/2/4] without verifying that those APDU bytes exist. bacnet_npdu_decode() can return offset == 2 for a 2-byte NPDU, so tiny PDUs pass the version check and then get read out of bounds. On ASan/MPU/strict builds this is an immediate crash (DoS). On unprotected builds it is undefined behavior and can mis-route replies; RCE is unlikely because only reads occur, but DoS is reliable.

Severity

7.5 (High)


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

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-125 - Out-of-bounds Read

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/bacnet-stack/bacnet-stack/secu…	x_refsource_CONFIRM
https://github.com/bacnet-stack/bacnet-stack/comm…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
bacnet-stack	bacnet-stack	Affected: < 1.5.0.rc2

Show details on NVD website

JSON

To clipboard

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CVE-2026-41503 (GCVE-0-2026-41503)

Vulnerability from cvelistv5 – Published: 2026-04-24 19:41 – Updated: 2026-04-27 13:39

Title

BACnet Stack: Out-of-Bounds Read in ReadPropertyMultiple Property Decoder via Deprecated Tag Parser

Summary

BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to 1.4.3, an out-of-bounds read vulnerability in bacnet-stack's ReadPropertyMultiple service property decoder allows unauthenticated remote attackers to read past allocated buffer boundaries by sending an RPM request with a truncated property list. The vulnerability stems from rpm_decode_object_property() calling the deprecated decode_tag_number_and_value() function at src/bacnet/rpm.c:344, which accepts no buffer length parameter and reads blindly from whatever pointer it receives. A crafted BACnet/IP packet with a 1-byte property payload containing an extended tag marker (0xF9) causes the decoder to read 1 byte past the end of the buffer, leading to crashes on embedded BACnet devices. The vulnerability exists in src/bacnet/rpm.c and affects any deployment that enables the ReadPropertyMultiple confirmed service handler (enabled by default in the reference server). This vulnerability is fixed in 1.4.3.

Severity

8.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-125 - Out-of-bounds Read

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/bacnet-stack/bacnet-stack/secu…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
bacnet-stack	bacnet-stack	Affected: >= 1.4.0, < 1.4.3

Show details on NVD website

JSON

To clipboard

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CVE-2026-41502 (GCVE-0-2026-41502)

Vulnerability from cvelistv5 – Published: 2026-04-24 19:40 – Updated: 2026-04-25 01:53

Title

BACnet Stack: Off-by-One Out-of-Bounds Read in ReadPropertyMultiple Object ID Decoder

Summary

BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to 1.4.3, an off-by-one out-of-bounds read vulnerability in bacnet-stack's ReadPropertyMultiple service decoder allows unauthenticated remote attackers to read one byte past an allocated buffer boundary by sending a crafted RPM request with a truncated object identifier. The vulnerability is in rpm_decode_object_id(), which checks apdu_len < 5 but then accesses all 6 byte positions (indices 0-5) — consuming 1 byte for the context tag, 4 bytes for the object ID, then reading apdu[5] for the opening tag check. A 5-byte input passes the length check but causes a 1-byte OOB read, leading to crashes on embedded BACnet devices. The vulnerability exists in src/bacnet/rpm.c and affects any deployment that enables the ReadPropertyMultiple confirmed service handler (enabled by default in the reference server). This vulnerability is fixed in 1.4.3.

Severity

8.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-125 - Out-of-bounds Read
CWE-193 - Off-by-one Error

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/bacnet-stack/bacnet-stack/secu…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
bacnet-stack	bacnet-stack	Affected: >= 1.4.0, < 1.4.3

Show details on NVD website

JSON

To clipboard

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CVE-2026-41475 (GCVE-0-2026-41475)

Vulnerability from cvelistv5 – Published: 2026-04-24 19:39 – Updated: 2026-04-27 13:41

Title

BACnet Stack: Out-of-Bounds Read in WritePropertyMultiple Decoder via Deprecated Tag Parser

Summary

BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to 1.4.3, an out-of-bounds read vulnerability in bacnet-stack's WritePropertyMultiple service decoder allows unauthenticated remote attackers to read past allocated buffer boundaries by sending a truncated WPM request. The vulnerability stems from wpm_decode_object_property() calling the deprecated decode_tag_number_and_value() function, which performs no bounds checking on the input buffer. A crafted BACnet/IP packet with a truncated property payload causes the decoder to read 1-7 bytes past the end of the buffer, leading to crashes or information disclosure on embedded BACnet devices. This vulnerability is fixed in 1.4.3.

Severity

8.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-125 - Out-of-bounds Read

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/bacnet-stack/bacnet-stack/secu…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
bacnet-stack	bacnet-stack	Affected: >= 1.4.0, < 1.4.3

Show details on NVD website

JSON

To clipboard

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CVE-2026-40279 (GCVE-0-2026-40279)

Vulnerability from cvelistv5 – Published: 2026-04-21 16:29 – Updated: 2026-04-21 19:18

Title

BACnet Stack: Undefined-behavior signed left shift in `decode_signed32()`

Summary

BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to 1.4.3, decode_signed32() in src/bacnet/bacint.c reconstructs a 32-bit signed integer from four APDU bytes using signed left shifts. When any of the four bytes has bit 7 set (value ≥ 0x80), the left-shift operation overflows a signed int32_t, which is undefined behavior per the C standard. This is flagged thousands of times per minute by UndefinedBehaviorSanitizer on any BACnet input containing signed-integer property values with high-bit-set bytes. This vulnerability is fixed in 1.4.3.

Severity

3.7 (Low)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-758 - Reliance on Undefined, Unspecified, or Implementation-Defined Behavior

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/bacnet-stack/bacnet-stack/secu…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
bacnet-stack	bacnet-stack	Affected: < 1.4.3

Show details on NVD website

JSON

To clipboard

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CVE-2026-26264 (GCVE-0-2026-26264)

Vulnerability from cvelistv5 – Published: 2026-02-13 18:14 – Updated: 2026-02-13 18:50

Title

BACnet Stack WriteProperty decoding length underflow leads to OOB read and crash

Summary

BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to 1.5.0rc4 and 1.4.3rc2, a malformed WriteProperty request can trigger a length underflow in the BACnet stack, leading to an out‑of‑bounds read and a crash (DoS). The issue is in wp.c within wp_decode_service_request. When decoding the optional priority context tag, the code passes apdu_len - apdu_size to bacnet_unsigned_context_decode without validating that apdu_size <= apdu_len. If a truncated APDU reaches this path, apdu_len - apdu_size underflows, resulting in a large size being used for decoding and an out‑of‑bounds read. This vulnerability is fixed in 1.5.0rc4 and 1.4.3rc2.

Severity

7.8 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N/E:P

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-125 - Out-of-bounds Read

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/bacnet-stack/bacnet-stack/secu…	x_refsource_CONFIRM
https://github.com/bacnet-stack/bacnet-stack/comm…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
bacnet-stack	bacnet-stack	Affected: >= 1.5.0rc1, < 1.5.0rc4 Affected: < 1.4.3rc2

Show details on NVD website

JSON

To clipboard

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CVE-2026-21878 (GCVE-0-2026-21878)

Vulnerability from cvelistv5 – Published: 2026-02-13 18:10 – Updated: 2026-02-13 18:53

Title

BACnet Stack Improperly Limits Pathnames to a Restricted Directory

Summary

BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to 1.5.0.rc3, a vulnerability has been discovered in BACnet Stack's file writing functionality where there is no validation of user-provided file paths, allowing attackers to write files to arbitrary directories. This affects apps/readfile/main.c and ports/posix/bacfile-posix.c. This vulnerability is fixed in 1.5.0.rc3.

Severity

7.5 (High)


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

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/bacnet-stack/bacnet-stack/secu…	x_refsource_CONFIRM
https://github.com/bacnet-stack/bacnet-stack/comm…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
bacnet-stack	bacnet-stack	Affected: < 1.5.0.rc3

Show details on NVD website

JSON

To clipboard

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CVE-2026-21870 (GCVE-0-2026-21870)

Vulnerability from cvelistv5 – Published: 2026-02-13 17:58 – Updated: 2026-02-13 18:19

Title

The BACnet Protocol Stack library has an Off-by-one Stack-based Buffer Overflow in tokenizer_string

Summary

BACnet Protocol Stack library provides a BACnet application layer, network layer and media access (MAC) layer communications services. In 1.4.2, 1.5.0.rc2, and earlier, an off-by-one stack-based buffer overflow in the ubasic interpreter causes a crash (SIGABRT) when processing string literals longer than the buffer limit. The tokenizer_string function in src/bacnet/basic/program/ubasic/tokenizer.c incorrectly handles null termination for maximum-length strings. It writes a null byte to dest[40] when the buffer size is only 40 (indices 0-39), triggering a stack overflow.

Severity

5.5 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-193 - Off-by-one Error

Assigner

GitHub_M

References

3 references

URL	Tags
https://github.com/bacnet-stack/bacnet-stack/secu…	x_refsource_CONFIRM
https://github.com/bacnet-stack/bacnet-stack/pull/1196	x_refsource_MISC
https://github.com/bacnet-stack/bacnet-stack/comm…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
bacnet-stack	bacnet-stack	Affected: <= 1.4.2 Affected: >= 1.5.0.rc1, <= 1.5.0.rc2

Show details on NVD website

JSON

To clipboard

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CVE-2025-66624 (GCVE-0-2025-66624)

Vulnerability from cvelistv5 – Published: 2025-12-05 18:36 – Updated: 2025-12-08 17:28

Title

BACnet-stack MS/TP reply matcher OOB read

Summary

BACnet Protocol Stack library provides a BACnet application layer, network layer and media access (MAC) layer communications services. Prior to 1.5.0.rc2, The npdu_is_expected_reply function in src/bacnet/npdu.c indexes request_pdu[offset+2/3/5] and reply_pdu[offset+1/2/4] without verifying that those APDU bytes exist. bacnet_npdu_decode() can return offset == 2 for a 2-byte NPDU, so tiny PDUs pass the version check and then get read out of bounds. On ASan/MPU/strict builds this is an immediate crash (DoS). On unprotected builds it is undefined behavior and can mis-route replies; RCE is unlikely because only reads occur, but DoS is reliable.

Severity

7.5 (High)


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

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-125 - Out-of-bounds Read

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/bacnet-stack/bacnet-stack/secu…	x_refsource_CONFIRM
https://github.com/bacnet-stack/bacnet-stack/comm…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
bacnet-stack	bacnet-stack	Affected: < 1.5.0.rc2

Show details on NVD website

JSON

To clipboard

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          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "bacnet-stack",
          "vendor": "bacnet-stack",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.5.0.rc2"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "BACnet Protocol Stack library provides a BACnet application layer, network layer and media access (MAC) layer communications services. Prior to 1.5.0.rc2, The npdu_is_expected_reply function in src/bacnet/npdu.c indexes request_pdu[offset+2/3/5] and reply_pdu[offset+1/2/4] without verifying that those APDU bytes exist. bacnet_npdu_decode() can return offset == 2 for a 2-byte NPDU, so tiny PDUs pass the version check and then get read out of bounds. On ASan/MPU/strict builds this is an immediate crash (DoS). On unprotected builds it is undefined behavior and can mis-route replies; RCE is unlikely because only reads occur, but DoS is reliable."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-125",
              "description": "CWE-125: Out-of-bounds Read",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-05T18:36:26.280Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/bacnet-stack/bacnet-stack/security/advisories/GHSA-8wgw-5h6x-qgqg",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/bacnet-stack/bacnet-stack/security/advisories/GHSA-8wgw-5h6x-qgqg"
        },
        {
          "name": "https://github.com/bacnet-stack/bacnet-stack/commit/9378f7d1e70169ebde4a5090bae7603703eadf48",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/bacnet-stack/bacnet-stack/commit/9378f7d1e70169ebde4a5090bae7603703eadf48"
        }
      ],
      "source": {
        "advisory": "GHSA-8wgw-5h6x-qgqg",
        "discovery": "UNKNOWN"
      },
      "title": "BACnet-stack MS/TP reply matcher OOB read"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2025-66624",
    "datePublished": "2025-12-05T18:36:26.280Z",
    "dateReserved": "2025-12-05T15:18:02.788Z",
    "dateUpdated": "2025-12-08T17:28:39.912Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Find a vulnerability

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16 vulnerabilities by bacnet-stack

CVE-2026-41503 (GCVE-0-2026-41503)

CVE-2026-41502 (GCVE-0-2026-41502)

CVE-2026-41475 (GCVE-0-2026-41475)

CVE-2026-40279 (GCVE-0-2026-40279)

CVE-2026-26264 (GCVE-0-2026-26264)

CVE-2026-21878 (GCVE-0-2026-21878)

CVE-2026-21870 (GCVE-0-2026-21870)

CVE-2025-66624 (GCVE-0-2025-66624)

CVE-2026-41503 (GCVE-0-2026-41503)

CVE-2026-41502 (GCVE-0-2026-41502)

CVE-2026-41475 (GCVE-0-2026-41475)

CVE-2026-40279 (GCVE-0-2026-40279)

CVE-2026-26264 (GCVE-0-2026-26264)

CVE-2026-21878 (GCVE-0-2026-21878)

CVE-2026-21870 (GCVE-0-2026-21870)

CVE-2025-66624 (GCVE-0-2025-66624)