Quick Answer
The primary risk is man-in-the-middle (MITM) attacks between services. This is because self-signed certificates lack a trusted Certificate Authority (CA) to validate identity; in a mutual TLS (mTLS) environment, each service must cryptographically prove its identity to the other. Without a CA chain of trust, an attacker can easily forge a self-signed certificate, intercept gRPC traffic, and impersonate a legitimate microservice. On the Certified Cloud Security Professional (CCSP) exam, this scenario tests your understanding of PKI trust models within microservice architectures—a common trap is assuming mTLS alone guarantees security, when in fact the certificate source is critical. Remember: mTLS without CA-signed certificates is like a locked door with a fake key; anyone can make one. Memory tip: "No CA, no trust—MITM is a must."
This CCSP practice question tests your understanding of cloud application security. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company deploys microservices in Kubernetes. Each service communicates via gRPC with mutual TLS. A security assessment reveals that some services use self-signed certificates. What is the primary risk?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
Inability to revoke certificates
Why wrong: Revocation is possible with CRLs/OCSP, but not the main risk.
Exposure of private keys in the container image
Why wrong: Key exposure is a separate concern.
Increased latency due to certificate validation
Why wrong: Performance impact is not the primary security risk.
Man-in-the-middle (MITM) attacks between services
Without trusted CA validation, MITM is possible.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Man-in-the-middle (MITM) attacks between services
The primary risk of using self-signed certificates in a gRPC mutual TLS environment is that there is no trusted Certificate Authority (CA) to verify the identity of the communicating services. Without proper CA-signed certificates, an attacker can easily perform a man-in-the-middle (MITM) attack by presenting a forged self-signed certificate, intercepting and modifying gRPC traffic between microservices.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Inability to revoke certificates
Why it's wrong here
Revocation is possible with CRLs/OCSP, but not the main risk.
Exposure of private keys in the container image
Why it's wrong here
Key exposure is a separate concern.
Increased latency due to certificate validation
Why it's wrong here
Performance impact is not the primary security risk.
Man-in-the-middle (MITM) attacks between services
Why this is correct
Without trusted CA validation, MITM is possible.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
ISC2 often tests the misconception that self-signed certificates are only a problem for revocation or key exposure, when the core issue is the lack of trusted identity verification enabling MITM attacks.
Detailed technical explanation
In gRPC with mutual TLS, each service presents a certificate to authenticate itself. Without a trusted CA, the client cannot cryptographically verify that the server's certificate was issued by a legitimate authority, allowing an attacker to generate a self-signed certificate and impersonate a service. This is especially dangerous in Kubernetes, where service-to-service communication often occurs over the internal network, and a compromised pod could intercept traffic using ARP spoofing or DNS hijacking.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A developer is choosing between AES-256 (symmetric) and RSA-2048 (asymmetric) for encrypting a large file that will be sent to a partner. Symmetric encryption is fast but requires key exchange; asymmetric is slower but solves the key distribution problem. A hybrid approach — encrypt the file with AES, encrypt the AES key with RSA — is standard. Questions like this test whether you understand when each approach applies.
What to study next
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FAQ
Cloud Application Security — This question tests Cloud Application Security — Read the scenario before looking for a memorised answer..
The correct answer is: Man-in-the-middle (MITM) attacks between services — The primary risk of using self-signed certificates in a gRPC mutual TLS environment is that there is no trusted Certificate Authority (CA) to verify the identity of the communicating services. Without proper CA-signed certificates, an attacker can easily perform a man-in-the-middle (MITM) attack by presenting a forged self-signed certificate, intercepting and modifying gRPC traffic between microservices.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
This CCSP practice question is part of Courseiva's free ISC2 certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CCSP exam.
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