Defensive Ops › Perimeter Security
Perimeter Security — Your perimeter is still the first line, even in a cloud-first world
SIRI Security hardens and manages your network perimeter — firewalls, VPN gateways, and edge devices — closing the misconfigurations that remain a common initial entry point for attackers.
62%Of cloud detections
70%Of malware detections
29.44LIncidents CERT-In handled
Why defensive infrastructure is now explicitly in scope
Live tracking · scroll to see every relevant change
Growing gap
62% CLOUD
Cloud misconfiguration and IAM exploitation account for 62% of detections in cloud environments (DSCI) — the exact territory defensive ops work is built to harden.
Effective
31 JUL 2026
RBI's 2026 Framework expects demonstrable perimeter and access controls as part of continuous resilience, not a one-time network design review.
Baseline
70% MALWARE
Trojans and file infectors make up 70% of malware detections (Seqrite 2026) — relevant to how perimeter and endpoint defences are prioritised.
Baseline
6 HR WINDOW
CERT-In's notification window makes a hardened, well-segmented environment the difference between a contained incident and a sprawling one.
Extending
12–18 MO
RBI's historical pattern of extending bank requirements to NBFCs — defensive infrastructure expectations are likely on this same trajectory.
Hardened and kept hardened, not configured once and forgotten
What does Perimeter Security involve?
Despite the shift to cloud and zero-trust architectures, perimeter devices — firewalls, VPN concentrators, edge routers — remain a common initial attack vector, usually through misconfiguration or unpatched firmware rather than a novel exploit.
We review and harden perimeter device configuration, ensure patching is current, and — where useful — take over ongoing management so perimeter security doesn't quietly drift out of date after the initial hardening project ends.
Defensive infrastructure is tested, not just deployed
62% of cloud detections trace to misconfiguration and IAM exploitation (DSCI) — precisely the category ongoing cloud and network configuration management is designed to keep closed, not just check once.
SIRI Security delivers Perimeter Security to this standard directly — practitioner-led, documented, and connected to SIRI Law LLP's legal and regulatory response if a finding ever needs to go further.
What organisations get wrong
Four assumptions that leave defensive infrastructure exposed
Defensive controls configured once tend to drift — new services, new access grants, new integrations all quietly erode the original design.
01 — DRIFT
“Our network architecture was reviewed at launch”
Access rules, cloud configurations, and network segmentation drift constantly as an environment grows — a launch-time review doesn't speak to today's state.
02 — SCOPE
“Perimeter security covers our cloud environment too”
Cloud misconfiguration is now a leading detection category (62%, DSCI) — a traditional perimeter mindset alone leaves that surface unmanaged.
03 — ACCESS
“Access grants are reviewed when someone leaves”
Access control drifts continuously, not just at offboarding — periodic review catches privilege creep that offboarding alone misses.
04 — DELIVERY
“Our CDN is just a performance tool”
CDN misconfiguration can expose origin infrastructure or enable cache-poisoning attacks — it carries its own security surface, not just a performance one.
What Perimeter Security covers
What's included, start to finish
Defensive infrastructure hardened and kept that way as your environment changes.
01
Firewall rule review
Overly permissive or outdated rules identified and remediated.
02
VPN configuration hardening
Secure configuration for remote access VPN gateways.
03
Edge device patch management
Ensuring perimeter devices run current, patched firmware.
04
Rule change management process
A process to prevent configuration drift after the initial hardening.
05
Ongoing managed option
Continuous management of perimeter devices as an ongoing service.
Evidence, not guesswork
No defensive ops programme vs. launch-time-only review vs. SIRI defensive ops
The gap between configured-once and continuously-managed is where drift quietly accumulates.
| Approach | No formal programme | Launch-time review only | SIRI Perimeter Security |
|---|---|---|---|
| Ongoing configuration management | No | No | Included |
| Cloud-specific coverage | Rare | Depends on scope | Included |
| Access control review cadence | None | At offboarding only | Periodic, proactive |
| Network segmentation verified | No | At launch only | Reviewed on an ongoing basis |
| Satisfies RBI's resilience expectations | No | Partially | Yes |
Sources: DSCI cloud detection data; RBI (Commercial Banks — Cybersecurity, Technology: Risk, Resilience and Assurance Framework) Directions, 2026; Seqrite 2026 threat report. Summarised for comparison.
Numbers every board should know
What defensive ops work is actually protecting against
62%
Of cloud detections
Trace to misconfiguration and IAM exploitation (DSCI).
70%
Of malware detections
Are trojans and file infectors (Seqrite 2026).
29.44L
Incidents CERT-In handled
In the latest reporting year — the backdrop defensive hardening is measured against.
6 HR
CERT-In notification window
The deadline a well-segmented, hardened environment helps make achievable by containing an incident quickly.
Why SIRI for Perimeter Security specifically
Defensive infrastructure managed by the same team that tests it
The practitioners who harden your perimeter and cloud configuration are the same ones who test whether it actually holds.
01
Directed by SIRI's Head of Cybersecurity
Vikram Rao, SIRI's Head of Cybersecurity, directs offensive security and incident response and leads CERT-In breach containment for enterprise clients.
02
Findings connected directly to legal exposure
SIRI Security runs under the same roof as SIRI Law LLP — when a finding carries real legal exposure, the engagement can be brought under attorney-client privilege from day one, not bolted on after the fact.
03
Cloud-aware by default
Coverage explicitly extends to cloud and virtualization environments, where the majority of current detections actually occur.
04
Built for RBI's specific resilience bar
Hardening and review cadence are scoped to the standard RBI's 2026 Framework expects from regulated entities.
Who this is built for
Organisations this defensive ops service is built for
Banks & NBFCs
SaaS & cloud-native companies
Organisations with growing cloud footprints
Enterprises with distributed or CDN-served content
Companies without a dedicated network security function
How we work
From scoping to ongoing delivery
01
Assessment & Design
We assess your current configuration and design the specific hardening or architecture changes needed.
Week 102
Implementation
Changes are implemented in coordination with your team, sequenced to avoid disrupting operations.
Weeks 2–303
Validation Testing
We validate the changes actually hold up against realistic testing, not just a configuration checklist.
Week 4+04
Ongoing Management
Where the service is ongoing, we continue to manage and adjust configuration as your environment evolves.
OngoingFrequently asked
Perimeter Security, answered directly
Do you manage our existing firewall, or recommend new hardware?
We work with your existing devices wherever feasible; replacement is only recommended where the hardware itself is genuinely end-of-life or insufficient.
Is this relevant if we're cloud-first?
Yes — cloud environments still have perimeter-equivalent controls (security groups, cloud firewalls, VPN gateways) that need the same rigor.
How long does this take?
Most engagements in this category run 2 to 6 weeks depending on environment size and complexity.
Do you manage this ongoing, or is it a one-time project?
Both models are available — we scope this as a one-time hardening project or an ongoing managed service depending on what you need.
Harden it, then keep it that way
Scope Perimeter Security.
Most engagements start with a configuration review before scoping ongoing management.
Talk to SIRI Security: +91 79819 12046
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