Security Resilience

CVE-2023-2876

Abb Rex640 Pcl1 Firmware 1.0.0 – 1.0.8

Published
13 June 2023
Modified
21 November 2024
Patch / advisory
CVSS Score v3.1 3.1
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
EPSS Score 0.0029 20th percentile
Risk Priority 28 floored blend · peak EPSS

CVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.

Summary

CVE-2023-2876 is a low-severity Sensitive Cookie Without 'HttpOnly' Flag (CWE-1004) vulnerability in Abb Rex640 Pcl1 Firmware. Its CVSS base score is 3.1 (Low).

Operationally, exploitation aligns with the MITRE ATT&CK technique Junk Data (T1001.001); ranked at the 20th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

OWASP Top 10 for Web (2025)

EU & UK References

Vulnerability Data

Sensitive Cookie Without 'HttpOnly' Flag vulnerability in ABB REX640 PCL1 (firmware modules), ABB REX640 PCL2 (Firmware modules), ABB REX640 PCL3 (firmware modules) allows Cross-Site Scripting (XSS).This issue affects REX640 PCL1: from 1.0;0 before 1.0.8; REX640 PCL2: from 1.0;0 before 1.1.4;…

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REX640 PCL3: from 1.0;0 before 1.2.1.

CWE(s)

Related Threats

MITRE ATT&CK Enterprise Techniques

T1001.001 Junk Data Command And Control
Adversaries may add junk data to protocols used for command and control to make detection more difficult.
T1005 Data from Local System Collection
Adversaries may search local system sources, such as file systems, configuration files, local databases, virtual machine files, or process memory, to find files of interest and sensitive data prior to Exfiltration.
T1007 System Service Discovery Discovery
Adversaries may try to gather information about registered local system services.
T1010 Application Window Discovery Discovery
Adversaries may attempt to get a listing of open application windows.
T1011 Exfiltration Over Other Network Medium Exfiltration
Adversaries may attempt to exfiltrate data over a different network medium than the command and control channel.
T1011.001 Exfiltration Over Bluetooth Exfiltration
Adversaries may attempt to exfiltrate data over Bluetooth rather than the command and control channel.
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2024-6739Shared CWE-1004, CWE-732
CVE-2024-41685Shared CWE-1004, CWE-732
CVE-2023-4228Shared CWE-1004, CWE-732
CVE-2025-3394Same vendor: Abb
CVE-2023-3322Same vendor: Abb
CVE-2024-11317Same vendor: Abb
CVE-2025-3395Same vendor: Abb
CVE-2024-6516Same vendor: Abb
CVE-2025-14773Same vendor: Abb
CVE-2023-0580Same vendor: Abb

Affected Assets

abb
rex640 pcl1 firmware
1.0.0 — 1.0.8
abb
rex640 pcl2 firmware
1.0.0 — 1.1.4
abb
rex640 pcl3 firmware
1.0.0 — 1.2.1

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

addresses: CWE-732

Procedures support proper permission assignment for critical resources through documented controls.

addresses: CWE-732

Attribute management for resources provides a mechanism to assign and maintain correct permissions based on security labels.

addresses: CWE-732

Prevents overly permissive assignments to critical resources by limiting to task needs.

addresses: CWE-732

Training policy covers correct permission assignment, reducing the ability to exploit incorrect permission assignments for critical resources.

addresses: CWE-732

Training on permission management reduces incorrect permission assignments for critical resources.

addresses: CWE-732

Audit logs and logging tools are critical resources whose protection requires correct permission assignments to block unauthorized actions.

addresses: CWE-732

Assessments review permission assignments on critical resources to confirm correctness, mitigating exploitation via incorrect permissions.

addresses: CWE-732

Certification includes checking that permissions on critical resources are correctly assigned.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
blocks

Broad SDLC practices catch cookie-handling defects via standards/testing (mostly forward) yet remain too general to guarantee this narrow flag setting is always enforced (partial reverse).

PR.AT-02 partial match
blocks

Role-based training can reduce the chance developers introduce missing HttpOnly flags but supplies no enforcement or detection, leaving essentially all of the implementation flaw's risk intact.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

blocks

A.5.1 only requires the existence of an overarching policy and topic-specific policies (including on access control); it does not itself enforce, implement, or act on permissions and therefore cannot stop CWE-732 from being exploitable.

blocks

A.5.12 only defines and communicates a classification scheme (with owners accountable for applying it); it does not itself enforce, restrict or decide any permissions, so the CWE-732 permission flaw can still be present and exploitable.

blocks

A.5.15 directly requires determining access needs, defining and communicating an access control policy, implementing rules that map rights/restrictions to entities (including consistency with classification), and considering need-to-know, privileged restrictions, segregation, formal authorization, and dynamic factors — which squarely stops most incorrect permission assignments from being exploitable; the bounded remainder is misconfigurations that violate the policy itself.

blocks

A.5.18 directly governs the provisioning, review, adjustment and revocation of logical access rights (including for critical resources) according to business needs, policy, SoD and risk, which stops most unintended actors from reading/modifying via incorrect permissions; the bounded remainder is incorrect permission assignments that are not access-right decisions at all (e.g. filesystem umask, ACL syntax errors).

blocks

Documented responsibility for protecting assets encourages correct permission settings rather than leaving them at insecure defaults.

finds

Monitoring supplier policy changes and conducting audits can reveal incorrect permission assignments on resources managed by the supplier, prompting corrective action before they are exploited.

Hardening callouts derived

DISA STIG baselines are authored against specific weaknesses. Where this CVE cites a broad weakness class, the mapping is not asserted at that abstraction (owner ruling, 2026-09-25: grade only at Base and below), so no rule is shown here rather than a rule shown against the wrong grain.

  • No fine-grained STIG row for CWE-732, a class-level weakness. Rules are authored against its narrower children: CWE-276, CWE-277, CWE-281.

References