On December 2021, Visor Finance was exploited in a reentrancy, resulting in approximately $8 in losses. That makes the Visor Finance exploit the 464th largest DeFi incident out of 690 documented in our archive.
Attack Mechanics: How the Visor Finance Reentrancy Played Out
Exploit Class Applied to Visor Finance
The Visor Finance incident on December 21, 2021 is classified as a Reentrancy. A malicious contract re-enters a vulnerable function before state is updated, letting it drain funds multiple times. In the full archive, Visor Finance is 1 of 51 documented reentrancy incidents.
Visor Finance in Context
At $8, the Visor Finance exploit is a minor (<$1M) event compared to the largest same-class incident in our archive — Curve (2023) at $41M.
Prior Reentrancy Before Visor Finance
The nearest reentrancy incident before Visor Finance was BurgerSwap, 208 days earlier on May 27, 2021. The same exploit class surfaced again within the reentrancy attack surface.
Impact & Recovery for Visor Finance
Visor Finance Loss Figure
The Visor Finance exploit caused $8 in losses — a minor (<$1M) incident and the 15th largest of 37 documented in 2021.
Where Visor Finance Sits Among Reentrancy Attacks
Ranked by loss size, Visor Finance is the 30th largest of 51 reentrancy incidents documented. That puts the Visor Finance loss below the class average of $2.87M.
Timeline Since the Visor Finance Incident
The Visor Finance exploit occurred 4.3 years ago (1,575 days). The contract, its fork-block, and the attack transaction remain on-chain and forensically reproducible.
Primary Reference for Visor Finance
Public post-mortem / on-chain analysis for the Visor Finance incident: view source.
FAQ
How much did Visor Finance lose?
The Visor Finance exploit in December 2021 resulted in $8 in losses — the 15th largest of 37 DeFi incidents that year.
When did the Visor Finance hack happen?
The Visor Finance exploit was recorded on December 21, 2021 — 1,575 days ago.
What type of exploit hit Visor Finance?
The Visor Finance incident is classified as a Reentrancy. A malicious contract re-enters a vulnerable function before state is updated, letting it drain funds multiple times.
How common is the Reentrancy pattern seen at Visor Finance?
Our archive contains 51 documented reentrancy incidents. The Visor Finance incident is one of them.
How does Visor Finance compare to the largest Reentrancy attack?
The largest reentrancy incident in our archive is Curve (2023) at $41M. The Visor Finance loss is $8.
What methodological tools were employed for the study's analysis?
Bibliometrix R-package and VOSviewer for bibliometric and content analysis.
What was the immediate effect on Moscow's MOEX index following the invasion?
It dropped almost 9% in the week following the invasion.