Seoul National University Hacked 28 Times in Six Years

What happened

Seoul National University (SNU), Korea's most prestigious national university, has been breached 28 times over the past six years. Two of those incidents resulted in confirmed leaks of personal data, affecting a combined 1,132 records.

The largest leak occurred in 2021, when an external attacker exploited a vulnerability in the university's website to get inside its systems — a textbook web application attack path. A second confirmed leak happened in 2024. In the remaining 26 incidents, no personal data exposure has been confirmed to date.

Four incidents occurred this year, including a web shell uploaded to a university site and a distributed denial-of-service (DDoS) attack that disrupted web services. A web shell is a small remote-control file an attacker plants on a server; once installed, it allows command execution and file theft, effectively serving as a beachhead for deeper intrusion.

The number that matters: attempts keep climbing

The more revealing figure isn't the breach count but the attempt count. Hacking attempts aimed at SNU have exceeded 500 per year, rising from 561 in 2024 to 575 last year and 588 so far this year — with the year not yet over.

Read the other way, only four or five of several hundred annual attempts turn into actual incidents, so the defenses are not failing outright. Still, 28 of them got through. And the phrase "no personal data leak confirmed," which applies to most of the incidents, is not the same as "no leak occurred." When log retention is short or monitoring coverage is partial, institutions often simply cannot prove either way.

Why universities are such attractive targets

For attackers, universities offer a high return on effort. They hold identity data on students, faculty and alumni plus research material, yet their security budgets and staffing lag far behind banks or large corporations. Just as importantly, campus IT is rarely centralized: colleges and individual labs run their own servers, department homepages, and one-off conference sites. Hundreds of assets end up with no clear owner, and these "forgotten servers" are the classic entry point for web shell attacks.

That the 2021 SNU incident came through a website vulnerability — and that a web shell upload resurfaced this year — suggests the same structural weakness has persisted for more than five years. Context worth noting for non-Korean readers: when a Korean company suffers a breach, it faces immediate regulatory fines and market pressure. Public universities face far less of that, which can slow the pace of remediation.

What it means in practice

At 1,132 records, the leak looks modest next to breaches measured in millions. But university-held data can extend beyond names and contact details to enrollment status, grades and research participation history, so sensitivity matters more than volume here. Even a small set of records is easily recycled into targeted phishing or impersonation.

For individuals, the practical steps are narrow but effective: stop reusing your university account password elsewhere, and turn on two-factor authentication. Phishing emails posing as "IT services" or "scholarship notices" become far more convincing when paired with a leaked student roster, so type the official portal address directly rather than clicking links.

Institutionally, the prerequisites are a full inventory of scattered web assets, longer log retention, and detection capable of confirming whether data actually left the network. As long as "unconfirmed" keeps being the answer, the breach statistics themselves are hard to trust.