Company: CCNE
Filing Date: 2025-01-10
Form Type: 425
Source: 0001193125-25-004105
Chunk: 119

Company: CNB FINANCIAL CORP/PA
Filing Date: 2025-01-10
Form: 425
Chunk 119
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 Agreement shall be deemed to apply to, or limit in
any manner, the obligations of Shareholder to comply with his or her fiduciary duties as a director or officer, as applicable, of ESSA.

Section 11. . This Agreement shall be governed by, and interpreted in accordance with, the laws of Commonwealth of
Pennsylvania, without regard for conflict of law provisions.

Section 12. . All notices and other communications
hereunder shall be in writing and shall be deemed given if delivered personally or sent by overnight courier (providing proof of delivery) to CNB in accordance with Section 8.06 of the Merger Agreement and to the Shareholder at his, her or its
address set forth on attached hereto (or at such other address for a party as shall be specified by like notice).

(Remainder of page intentionally left blank.)

IN WITNESS WHEREOF, the parties hereto have executed and delivered this Agreement as of the date first written above.

| CNB FINANCIAL CORPORATION |     |                                       |
| By:                       |     |                                       |
| Name:                     |     | Michael D. Peduzzi                    |
| Title:                    |     | President and Chief Executive Officer |
| SHAREHOLDER               |     |                                       |
| Name:                     |     |                                       |

[Signature Page to Voting Agreement]

EXHIBIT A

| NAME AND ADDRESS 
 OF SHAREHOLDER   |     | SHARES OF ESSA COMMON STOCK BENEFICIALLY OWNED |

Exhibit B

Form of CNB Voting Agreement

VOTING AGREEMENT This VOTING AGREEMENT(this “ Agreement”) is dated as of January 9, 2025, by and between [_________] (the “ Shareholder”) and ESSA Bancorp, Inc., a Pennsylvania corporation (“ ESSA”). All terms used herein and not defined herein shall have the meanings assigned thereto in the Merger Agreement (as defined below). WHEREAS,concurrently with the execution of this Agreement, CNB Financial Corporation, a Pennsylvania corporation (“ CNB”), CNB Bank, a Pennsylvania-chartered nonmember bank and wholly-owned subsidiary of CNB (“ CNB Bank”), ESSA and ESSA Bank & Trust, a Pennsylvania-chartered stock savings bank and wholly-owned subsidiary of ESSA (“ ESSA Bank”), are entering into an Agreement and Plan of Merger (as such agreement may be subsequently amended or modified, the “ Merger Agreement”), pursuant to which ESSA