We might earn a commission when you buy through our links.
Learn more

X-aspnet-version 4.0.3 Vulnerabilities Site

Author: Security Research Division Date: March 2025 Classification: Technical White Paper Abstract The X-AspNet-Version HTTP response header is emitted by default in many Microsoft ASP.NET deployments, including those running version 4.0.30319 (commonly referred to as ASP.NET 4.x). While not a direct vulnerability, exposure of this header provides attackers with fingerprinting capabilities that accelerate reconnaissance and increase the likelihood of targeted exploitation. This paper details the specific vulnerabilities associated with ASP.NET 4.0.30319 when the header is present, including view state tampering, padding oracle attacks, and information disclosure via stack traces. Mitigation strategies and configuration hardening steps are provided. 1. Introduction ASP.NET 4.0.30319 is a widely used runtime version for web applications on Windows Server infrastructures. By default, IIS adds the X-AspNet-Version header to every HTTP response. For example:

protected void Application_PreSendRequestHeaders(object sender, EventArgs e) x-aspnet-version 4.0.3 vulnerabilities

POST /default.aspx HTTP/1.1 X-AspNet-Version: 4.0.30319 Content-Type: application/x-www-form-urlencoded __VIEWSTATE=/wEPDwUKLT... (malicious Base64 blob) By default, IIS adds the X-AspNet-Version header to

<system.web> <httpRuntime enableVersionHeader="false" /> </system.web> : httpRuntime enableVersionHeader="false" /&gt

[X-AspNet-Version: 4.0.30319] Stack Trace: [NullReferenceException: Object reference not set to an instance of an object.] MyApp.DataLayer.GetUser(String id) in C:\Projects\MyApp\DataLayer.cs:line 42 A realistic attack scenario using the exposed header:

Swarovski
BOOST OF THE DAY
Swarovski

Earn 12% Cashback on Your Orders

About PCA Skin

PCA SKIN has spent 30 years using real science to get real results, which is why we think they're a smart choice. They produce skincare that is backed by science that can change your skin and your life. What makes them special is that you can use their products at home or visit trained professionals for treatments. Products include cleansers, toners, masks, and serums that work great for all skin types.

For more information about their products or to get personalized support, you can call or text 844-722-2428 Monday through Friday, 8 a.m. to 4:30 p.m. CST. You can also reach out through their online contact form.

How PCA SKIN handles returns

We looked into PCA SKIN's return policy. They accept returns and refunds within 60 days of purchase. To start you need to reach out to their consumer support team to get a return authorization (RMA) number. Expired items, items you received as a free gift, or products that are more than 50% used will not be accepted.

If an item arrives damaged, they may replace it or offer a partial refund after they check it out.

Note that you'll be responsible for return shipping. Once they receive and log your return, they'll start processing your refund back to your original payment method. Returns can take up to three weeks to process.

10%OFF
CODE
Until 03/13/2026

10% Discount Available

This promo code is not valid on taxes, shipping, or handling fees (unless explicitly included).

10%OFF
CODE
Until 03/11/2026

10% Off Any Order

FREESHIPPING
CODE
Until 03/12/2026

Free Shipping on Any Order

20%OFF
CODE
Until 03/10/2026

20% Off Orders

20%OFF
CODE
Until 03/10/2026

20% Off Sitewide

10%OFF
DEAL
Until 03/10/2026

10% Off First Order with Email Subscription

This offer is valid for new subscribers only. Discount code will be sent via email after successful subscription.

  • Customer Requirements:
    New Customers
  • Discount:
    10%
FREESHIPPING
DEAL
Until 03/11/2026

Free Standard Ground Shipping on $100+

10%OFF
DEAL
Until 03/09/2026

10% Off All Subscription Orders

Subscribe and enjoy 10% off every subscription order. You can experience the convenience of automatic deliveries, exclusive discounts, and easy replenishments.

  • Discount:
    10%
  • Customer Requirements:
    New and Existing Customers

Missed these coupons?

Keep an eye out as they might come back

FREEGIFTS
DEAL
Free Trial Size HydraMatte & Intensive Clarity Treatment on $100+
FREEGIFT
DEAL
Free Gift on $100+ Orders

Eligible customers will receive a travel size HydraMatte NAD Intensive Clarity Treatment on orders of $100 or more. Offer valid only on PCASKIN.com and cannot be applied to previous purchases, taxes, shipping charges, redeemed for cash, or used in combination with any other offer. PCASKIN products are available online to U.S. customers with delivery to continental U.S. residential addresses. No P.O. boxes. Free gifts, trial sizes, or samples cannot be returned or exchanged for retail value. Subscription items and recurring subscription orders are excluded from this offer. Exclusions may apply. Terms and conditions are subject to change. Offer expires 02/25/2026 at 11:59 p.m. PST or while supplies last.

20%OFF
CODE
20% Off Your Purchase at PCA SKIN

Restrictions apply.

Author: Security Research Division Date: March 2025 Classification: Technical White Paper Abstract The X-AspNet-Version HTTP response header is emitted by default in many Microsoft ASP.NET deployments, including those running version 4.0.30319 (commonly referred to as ASP.NET 4.x). While not a direct vulnerability, exposure of this header provides attackers with fingerprinting capabilities that accelerate reconnaissance and increase the likelihood of targeted exploitation. This paper details the specific vulnerabilities associated with ASP.NET 4.0.30319 when the header is present, including view state tampering, padding oracle attacks, and information disclosure via stack traces. Mitigation strategies and configuration hardening steps are provided. 1. Introduction ASP.NET 4.0.30319 is a widely used runtime version for web applications on Windows Server infrastructures. By default, IIS adds the X-AspNet-Version header to every HTTP response. For example:

protected void Application_PreSendRequestHeaders(object sender, EventArgs e)

POST /default.aspx HTTP/1.1 X-AspNet-Version: 4.0.30319 Content-Type: application/x-www-form-urlencoded __VIEWSTATE=/wEPDwUKLT... (malicious Base64 blob)

<system.web> <httpRuntime enableVersionHeader="false" /> </system.web> :

[X-AspNet-Version: 4.0.30319] Stack Trace: [NullReferenceException: Object reference not set to an instance of an object.] MyApp.DataLayer.GetUser(String id) in C:\Projects\MyApp\DataLayer.cs:line 42 A realistic attack scenario using the exposed header:

Details about free shipping

PCA SKIN offers free ground shipping on orders over $100. With a promo code, you might even get free shipping with no minimum spend. Don't have one? Shipping costs just $5 for orders under $100. We noticed that most deliveries arrive in about four to six business days.

Subscribe & save 10%

You can get 10% off every subscription order at PCA SKIN. Just choose the "Subscribe and Save" option before you check out. We like this because you can set your delivery schedule to every month, or every two, three, four, or five months. It's all about whatever works best for you.

How to apply a promo code at PCA Skin

We'll walk you through how to apply your promo code so you can save on your skincare must-haves. Here's what to do:

  1. Add your favorite skincare items to your shopping bag

  2. Click on the bag icon in the top right corner of your screen

  3. Type or paste your promo code into the designated box

  4. Click "Apply Promo Code" to see your new lower price

Ready to express your opinion about the seller?

You can write a review for your approved transactions.

undefined .
undefined