Build sharpersecurity instincts.
Short, realistic missions across code, systems, vulnerabilities, and interviews.
CVE-2023-48795
HTTP/2 parser investigation
124 if (len > frame.remaining) {
129 copy(buf, src, len);
133 cursor += len;
Missing cursor bounds check
Finding pinned
Root cause identified
Cursor is not revalidated.
+85
XP
9
skill domains
4
mission modes
5 min
daily loop
Practice the security workbehind the answer.
5-minute missions that build real security reasoning across code, systems, vulnerabilities, and interview explanations. Built for how engineers actually learn.
CVE-2023-48795
HTTP/2 parser investigation
124 if (len > frame.remaining) {
129 copy(buf, src, len);
133 cursor += len;
Missing cursor bounds check
Finding pinned
Root cause identified
Cursor is not revalidated.
+85
XP
CVE-2023-48795
Out-of-bounds write in HTTP/2 parser
Case brief
Vuln.c
A heap buffer overflow in the HTTP/2 header parser can be triggered by crafted CONTINUATION frames.
Your mission
Identify the root cause, the safety guard that is missing, and propose a practical remediation.
Artifacts
- • `nghttp2_session.c`
- • `frame.c`
- • `packet_diff.md`
124 if (len > frame_header.remaining) {
125 return -1;
129 copy(buf, src, len);
133 cursor += len;
139 missing bounds check before cursor advance
144 return 0;
Registers
Debugger
Finding pinned
Root cause
A write crosses the allocated buffer because `len` is validated once but the moving cursor is not checked before every copy.
Built around the work
Practice inside the problem.
Every mission puts the evidence, tools, and explanation loop in your hands.
Inspect
Read code, logs, and system state.
Reason
Trace the cause and choose the next move.
Explain
Turn the finding into defensible judgment.
Evidence-led learning
See the work. Learn the why.
SecMissions sells itself best when the product is visible. Every surface on the page points back to how the training loop actually works.
Practice engine
Short labs, clear state, immediate feedback.
Sandbox VM
RQASM sandbox, debugger state, safe reasoning loops.
Interview feedback
Clarity, depth, and security judgment scoring.
See the product in action
Four ways to sharpen your judgment.
Interview Prep Feedback
Explain your reasoning out loud. Get scored feedback on clarity, depth, and the security thinking that recruiters actually look for.
Question
Walk me through how you would triage a suspected remote code execution issue in a production service.
2:14
Your answer
I would reproduce in a safe environment, confirm the exploit path, identify blast radius, and only then prioritize containment and patching.
85
/100
Strengths
- • Clear structure
- • Risk prioritization
- • Mentions mitigation
Improve
- • Add detection strategy
- • Discuss blast radius
Skill Challenges + Debugger
Run the code. Inspect the state. Visualize registers, memory, and output to understand what the program is really doing.
58 if (user_len > sizeof(buf))
60 memcpy(buf, user_input, user_len);
61 process(buf);
62 root cause depends on cursor growth beyond available space
Registers
R1
0x00000048
R2
0x00000030
R3
0x7FFDFFE10
R4
0x00000001
Memory
CVE Mission Analysis
Real-world case studies with safe framing. Identify root cause, assess impact, and propose remediations with confidence.
Findings
Out-of-bounds write in parse_header()
High
95%
Pinned
Integer overflow in content-length
Medium
80%
Open
Missing bounds check in hpack_decode()
Medium
70%
Open
Root cause
The function copies bytes into a 256-byte stack buffer without ensuring the running length remains bounded after each continuation frame.
Impact
Remote attackers can trigger memory corruption, which may lead to denial of service or code execution depending on allocator behavior.
Fix path
Re-check bounds after cursor movement, cap copy length, and add regression coverage around fragmented header sequences.
Skill Path Progress
Track progress across domains. Every mission you complete strengthens your path and unlocks the next challenge.
Web Security Path
Level 12 • 2,450 XP
HTTP basics
Complete
IDOR
Complete
SQL injection
Complete
XSS
Complete
Auth bypass
In progress
Security review
Locked
Pick a path. Master the fundamentals.
Choose a path. Build durable instincts.
The curriculum is grouped around the kinds of security reasoning people actually need at work, not generic content buckets.
Application Security
Find weakness patterns in web apps and APIs before they become incidents.
12
missions
Cloud & Systems
Reason through infra, identity boundaries, containers, and misconfiguration chains.
12
missions
Exploit Reasoning
Understand how vulnerabilities work so you can triage, patch, and explain them defensively.
12
missions
Secure Code Review
Practice code reading, flaw discovery, and fix narratives under realistic constraints.
12
missions
Identity & Crypto
Trace auth flows, token risk, crypto choices, and access-control drift.
12
missions
Detection & Threat Modeling
Spot weak signals early, model blast radius, and prioritize the next move.
12
missions
Built for the whole market
Learners
Build real instincts with short daily practice loops, not passive content.
- • 5-minute mission rhythm
- • Hands-on debugger work
- • Feedback after every solve
Career Switchers
Move from curiosity to confidence with structured paths and portfolio-ready reasoning.
- • Role-shaped path guidance
- • Interview explanation drills
- • Progress you can actually show
Security Teams
Upskill engineers with repeatable, measurable training that fits the work week.
- • Role-based practice paths
- • Shared vocabulary for review
- • Progress and completion visibility
Partners & Investors
A product layer built around durable security reasoning, not disposable quiz content.
- • Clear product wedge
- • Content velocity potential
- • Expands with every new mission family
Early momentum
4,200+
Invites requested
68%
First mission complete
37%
7-day return rate
6/week
Mission velocity
Directional product metrics placeholder for deck and landing polish.
Why this matters
Security teams do not just need awareness. They need sharper reasoning loops.
SecMissions turns that gap into a product: short, repeatable, measurable training that looks more like real security work than classroom content.
PWA-ready. Learn anywhere.
Your lab in your pocket.
Full experience on the web. Install the app for offline reminders, fast return sessions, and on-the-go practice when a full desktop setup is overkill.
Daily challenge
Today
XSS Game
Auth Logic Flaw
CompleteStreak
7 days
Keep the habit alive.
XP today
150/ 200
Pricing
Built between solo practice and enterprise readiness.
SecMissions is priced for individual learners building real security skill, with a clear path into team training when readiness becomes a shared responsibility.
Create an account and select your tier now. Paid access activates after checkout is connected.
Free
For curious learners starting cyber reasoning practice.
$0
No card required
- 10 starter missions
- 1 daily challenge per week
- Basic terminal missions
- Limited progress tracking
- Community updates
Pro
For consistent weekly cyber skill practice.
$19/mo
or $149/year
- Full mission library
- Daily challenge access
- All skill paths
- Terminal, code review, log, and reasoning missions
- Hints and explanations
- XP, streaks, ranks, and progress tracking
- New missions added regularly
Career
For cyber interviews, career switching, and role readiness.
$39/mo
or $349/year
- Everything in Pro
- Interview Lab
- AI feedback on explanations
- Role-based interview paths
- Security reasoning score
- Saved answer history
- Mock interview drills
- Portfolio-style progress summary
Team Starter
For small security teams, graduate programs, and security champions.
$49/user/mo
billed annually
- Team dashboard
- Manager progress view
- Cohort-based learning paths
- Weekly challenge packs
- Team completion tracking
- Invoice support
- Minimum 5 seats
Need a larger rollout?
Business and enterprise plans
Business plans start from $12k/year for cohorts, reporting, and custom learning paths. Enterprise plans start from $25k/year for private content, procurement support, custom reporting, and dedicated onboarding.
Founding member offer
Founding members get early access pricing.
Create your account before launch and select a founding tier for discounted annual pricing in your first year.
- Pro for $99/year
- Career for $249/year
- Team Starter from $399/user/year for the first cohort
- Founder badge and early access to new paths
Plan comparison
What each plan includes
Compare plan access across the complete training experience.
Career
Most popular- Starter missions
- Yes
- Full mission library
- Yes
- Daily challenges
- Yes
- Terminal and code missions
- Yes
- Log and investigation missions
- Yes
- Interview Lab
- Yes
- AI feedback
- Yes
- Role-based paths
- Yes
- Team dashboard
- No
- Invoice support
- No
Start training like a security engineer.
Create your SecMissions account.
Start with the Free mission set, choose your training goal, and keep your selected Pro or Career tier ready for checkout.