On February 2021, Yearn YDai suffered a slippage abuse on Ethereum — the first of 13 documented slippage abuse incidents in our archive where the loss figure was not publicly disclosed but the exploit pattern is documented below.
Attack Mechanics: How the Yearn YDai Slippage Abuse Played Out
Exploit Class Applied to Yearn YDai
The Yearn YDai incident on February 4, 2021 is classified as a Slippage Abuse. Unprotected swap routes let the attacker extract value through sandwich trades or price drift. In the full archive, Yearn YDai is 1 of 13 documented slippage abuse incidents.
Yearn YDai in Context
The Yearn YDai incident joins a class whose largest loss to date is DCFToken (2025) at $442K.
Yearn YDai Vulnerability Signature
The primary source categorises the Yearn YDai exploit specifically as “Slippage proection absent”. This narrower label is entity-specific: it reflects how the Yearn YDai contract failed, rather than the broad slippage abuse pattern alone.
Target Chain: Ethereum
The vulnerable Yearn YDai contract was deployed on Ethereum — one of 9 documented incidents on Ethereum. This determines the block cadence, mempool, and forensic tooling available to investigators.
Impact & Recovery for Yearn YDai
Yearn YDai Loss Figure
The loss figure for Yearn YDai is not publicly disclosed. The primary source reports the exploit in non-USD terms, so no USD estimate is published here. For reference, the average loss across 13 slippage abuse incidents in our archive is $119.9K.
Timeline Since the Yearn YDai Incident
The Yearn YDai exploit occurred 5.2 years ago (1,895 days). The contract, its fork-block, and the attack transaction remain on-chain and forensically reproducible.
Primary Reference for Yearn YDai
Public post-mortem / on-chain analysis for the Yearn YDai incident: view source.
FAQ
How much did Yearn YDai lose?
The Yearn YDai loss figure is not publicly disclosed. The primary source reports the exploit in non-USD token terms, so no USD estimate is published here.
When did the Yearn YDai hack happen?
The Yearn YDai exploit was recorded on February 4, 2021 — 1,895 days ago.
What type of exploit hit Yearn YDai?
The Yearn YDai incident is classified as a Slippage Abuse. Unprotected swap routes let the attacker extract value through sandwich trades or price drift.
Which blockchain was Yearn YDai deployed on?
The Yearn YDai contract was deployed on Ethereum, one of 9 documented incidents on that chain.
How does Yearn YDai compare to the largest Slippage Abuse attack?
The largest slippage abuse incident in our archive is DCFToken (2025) at $442K. The Yearn YDai loss was not publicly disclosed.
How does the document propose blockchain technology impacts player engagement and educational outcomes?
Blockchain technology improves educational outcomes and user engagement by ensuring transparency, security, and ownership in gaming.
How are cumulative abnormal returns (CAR) calculated?
CARs are the sum of abnormal returns over a certain period after the event.