[INDIA] RBI, SEBI and IRDAI · Source-code escrow and continuity obligations for critical applications[EU DORA] ICT third-party risk testing required · In force Jan 2025[PRA] SS2/21 UK · Vendor recovery evidence required[MAS] Singapore TRM · Independent vendor recoverability expected[APRA] CPS 230 Australia · Third-party continuity obligations in force[FFIEC] United States · Source-code access and software escrow addressed in third-party contracts[ENTERPRISE] Mission-critical software procurement increasingly requires continuity evidence before contract
[INDIA] RBI, SEBI and IRDAI · Source-code escrow and continuity obligations for critical applications[EU DORA] ICT third-party risk testing required · In force Jan 2025[PRA] SS2/21 UK · Vendor recovery evidence required[MAS] Singapore TRM · Independent vendor recoverability expected[APRA] CPS 230 Australia · Third-party continuity obligations in force[FFIEC] United States · Source-code access and software escrow addressed in third-party contracts[ENTERPRISE] Mission-critical software procurement increasingly requires continuity evidence before contract
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GLOBAL · ISO/IEC 27001

ISO 27001Information Security Management Systems

ISO/IEC 27001 is the international standard for information-security management, including supplier-relationship and operations-security controls relevant to third-party software. This guide explains the requirement, scope, timeline and evidence mapping for software escrow and Software Recoverability.

REGULATORY EVIDENCE MAP

ISO 27001

Published · ISO/IEC 27001:2022
01

PERIMETER

Global Standards

02

REQUIREMENT

An information-security management system (ISMS)

03

CASTLER EVIDENCE

Supplier-relationship controls are reinforced by independent rebuild + verification

OUTPUT

Signed Proof of Recovery

ARTICLE ANATOMY

Information Security Management Systems

Published · ISO/IEC 27001:2022

Who it applies to

  • Entities and teams responsible for an information-security management system (ISMS)
  • Entities and teams responsible for supplier-relationship security controls
  • Entities and teams responsible for operations security and change management
  • Entities and teams responsible for continual improvement and assurance

ISO/IEC 27001:2022 is the current published edition. Certification and transition timing depends on the organisation’s certification programme and audit cycle rather than a single statutory deadline.

Requirement

An information-security management system (ISMS)

Castler artefact

Supplier-relationship controls are reinforced by independent rebuild + verification

Requirement

Supplier-relationship security controls

Castler artefact

A signed Proof of Recovery is concrete evidence for ISMS assurance

Requirement

Operations security and change management

Castler artefact

Change is re-verified release-over-release

Requirement

Continual improvement and assurance

Castler artefact

Recoverability supports your statement of applicability

THE GLOBAL REGULATORY MANDATE

The regulator stopped asking “Do you have escrow?” It now asks “Can you prove recovery?”

Across financial regulation, cyber-resilience rules and global assurance standards, the direction is converging: critical third-party software must remain current, testable and recoverable when its provider fails.

17

MANDATES

9

JURISDICTIONS

European UnionUnited KingdomUnited StatesAustraliaSingaporeSaudi ArabiaUnited Arab EmiratesGlobal StandardsIndia
Explore every mandate and evidence map

1 · WHAT THE REGULATION IS

What is ISO 27001?

Information Security Management Systems is the governing framework or standard represented on this page.

ISO/IEC 27001 is the international standard for information-security management, including supplier-relationship and operations-security controls relevant to third-party software. For a CIO, CISO or compliance officer, the practical issue is whether a critical third-party application can remain available when the provider fails, exits, is acquired or can no longer support the product.

Software escrow addresses custody: who holds the source code, build materials and documentation. Software Recoverability addresses the next question: whether those materials have been independently rebuilt, deployed and tested. The distinction matters because an agreement and a deposit do not prove that recovery can be completed within the institution’s operational tolerance.

Castler therefore treats the requirement as part of vendor onboarding. The agreement and first deposit are established when the relationship begins, every release is captured, and the verification evidence is renewed before an auditor, insurer or supervisor asks for it.

2 · EXACT REQUIREMENT

Information Security Management Systems

In summary

An information-security management system (ISMS); Supplier-relationship security controls; Operations security and change management; Continual improvement and assurance

Reference: International Organization for Standardization — ISO/IEC 27001:2022, Information security management systems — Requirements. For legal interpretation and exact operative wording, use the current official text and advice applicable to your supervisory perimeter.

In practical terms, compliance requires more than a clause in the vendor contract. The institution must identify which applications are critical, establish custody or source-code access, ensure the deposited materials remain current, document release conditions and maintain evidence that continuity or exit can be executed.

Where the framework requires tested recovery, resilience or credible exit, a stored deposit is only the starting control. Independent build evidence, deployment instructions, architecture replication and a signed engineer review show that the recovery path has been exercised rather than assumed.

3 · Who it applies to

Entities and teams responsible for an information-security management system (ISMS)

Entities and teams responsible for supplier-relationship security controls

Entities and teams responsible for operations security and change management

Entities and teams responsible for continual improvement and assurance

The accountable group normally includes technology, information security, outsourcing, procurement, compliance, business continuity and the business owner of the supported service. Scope should be based on criticality, not only contract value.

4 · Compliance timeline

Published · ISO/IEC 27001:2022

ISO/IEC 27001:2022 is the current published edition. Certification and transition timing depends on the organisation’s certification programme and audit cycle rather than a single statutory deadline.

Organisations should align implementation, evidence collection and review cadence with the applicable certification, examination, supervisory or contractual cycle. Vendor identification, agreement execution, repository integration, initial deposit, reconciliation and first verification all require lead time.

5 · CONSEQUENCES

What happens when the evidence is missing?

Failure to maintain credible third-party resilience can lead to audit findings, remediation programmes, increased supervisory scrutiny, reputational damage and operational loss during a provider disruption.

The operational consequence can be more severe than the supervisory consequence. If a critical provider fails and the deposited software cannot be built or deployed, the institution may breach customer commitments, impact tolerances, market obligations and board-approved continuity objectives while the technical team reconstructs undocumented knowledge under incident conditions.

A current custody record and signed Proof of Recovery reduce that uncertainty. They do not replace legal analysis, incident planning or the institution’s own controls; they create tested technical evidence that those controls rely on.

6 · CASTLER EVIDENCE MAPPING

How Castler maps to ISO 27001.

The mapping is specific: each obligation is paired with the Castler artefact or operating control that provides relevant evidence. It is not a claim that software alone guarantees compliance.

Regulatory requirementCastler evidence
An information-security management system (ISMS)Supplier-relationship controls are reinforced by independent rebuild + verification
Supplier-relationship security controlsA signed Proof of Recovery is concrete evidence for ISMS assurance
Operations security and change managementChange is re-verified release-over-release
Continual improvement and assuranceRecoverability supports your statement of applicability

Cloud Custody

Establish the software escrow agreement, current deposit, release history and audit trail required as the custody foundation.

Explore custody →

Software Recoverability

Add independent rebuild, deployment, replication, confidence scoring and an engineer-sealed Proof of Recovery.

Explore Proof of Recovery →

7 · FREQUENTLY ASKED QUESTIONS

ISO 27001 questions from compliance and technology teams.

Does having a software escrow agreement satisfy the requirement?

An agreement can satisfy the contractual custody element, but ISO 27001 also expects the institution to manage continuity, third-party risk or recovery evidence. The exact answer depends on the clause and supervisory perimeter.

How current must the source-code deposit be?

The deposit should track the production release. Automated repository capture, version history and release identifiers make it possible to show that updates and fixes are included rather than relying on the original filing.

Does the software vendor need to participate in every verification?

The vendor participates in onboarding, deposit setup and structured reconciliation where documentation is missing. Verification is then designed to run independently so the vendor does not need to be present every time.

What evidence should be presented to an auditor or supervisor?

Present the executed escrow arrangement, deposit and release history, build report, deployment runbook, replication report, SBOM, confidence score, exception record and signed Proof of Recovery for the release in scope.

Can an institution begin with custody and add verification later?

Yes. Cloud Custody establishes the current deposit and agreement. The same record can be upgraded to Standard or Premium Software Recoverability without creating a new custody foundation.

How often should recoverability be re-tested?

Re-test when the vendor releases a material version and according to the institution’s criticality, regulatory and board-approved assurance cycle. Per-release verification avoids stale annual evidence.

8 · RELATED REGULATIONS

Continue the third-party resilience mapping

European Union

EU DORA

DORA requires financial entities to keep ICT third-party risk under control across the full lifecycle of a contract — including a documented exit strategy and assurance that a critical or important function can continue if a provider fails (Article 28).

Read the mapping

Global Standards

ISO 22301

ISO 22301 specifies requirements for a business-continuity management system — the capability to continue delivering products and services at acceptable levels after disruption.

Read the mapping

Global Standards

SOC 2

SOC 2 reports on controls relevant to the trust-services criteria, including availability — the system's ability to be available for operation and use to meet commitments.

Read the mapping

This guide is for regulatory orientation and does not constitute legal advice. Verify obligations against current official texts and professional advice for your entity.

ISO 27001

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