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Web browser engine, and OpenSSL (or equivalent) patches alone are the main concern in userspace. Those codebases are a constantly moving target. Look at the str

Web browser engine, and OpenSSL (or equivalent) patches alone are the main concern in userspace. Those codebases are a constantly moving target. Look at the stream of CVEs and security patches that Apple publishes. Almost every bug affects every product because of how much code is shared up and down the stack.

Schiendelman 1y ago
You know they keep updating Safari and making security updates for old OSes for years, right?
- smaccona 1y ago
  Apple is definitely not the worst in this regard, but the most recent version of iOS to support the iPad 3rd generation (the device we are discussing which is being used as a PDF reader) is iOS 9.3.5 (a security/bugfix release on August 25, 2016 which supports the WiFi-only version of the iPad 3rd generation) or iOS 9.3.6 (also a bugfix release on July 22, 2019 which supports the WiFi+cellular version of the same device - specifically, this was a fix to keep GPS working). The iPad 3rd generation was released in 2012, so the 2016 9.3.5 iOS release gave 4 years of security/bugfix support for the WiFi-only version of that device.
  - Schiendelman 1y ago
    Sure, but there haven't been any security exploits in that version of iOS since then. It still works.
    - kennywinker 1y ago
      Not sure what you’re meaning? A CVE like this: https://nvd.nist.gov/vuln/detail/CVE-2025-24201 https://nvd.nist.gov/vuln/detail/CVE-2025-24201 found in 2025 impacts iOS versions before 18.3.1 (Safari and iOS are shipped together). Which means there is a decent chance an iPad running 9.3.2 is vulnerable. And there have been thousands of CVEs since 9.3.2. Most of low severity, but not all.
      - ohnooonotagain 1y ago
        [dead]
      - Schiendelman 1y ago
        Apple patches anything with a proven exploit. While it may be vulnerable, no one has written and shown Apple an exploit.
        kennywinker 1y ago
        Apple patches anything with a proven exploit as long as it’s in a supported version of the OS. E.g. They will not patch versions beyond macos 10.14 i believe, not sure what the cutoff for iOS is but it’s usually about 6 years of security updates. Which means that iOS 9.3.5 is well outside of that and so a bug that impacts that os will not be patched. Which means using an old device like that on the open internet is deeply foolish
        Schiendelman 1y ago
        My whole point is that what you believe isn't correct. Apple continues to release security updates for "unsupported" versions (let's be careful about terminology, that term is specific and we're both using it), generally for two more years after a version becomes unsupported. This is in a lot of the reporting about the topic and linked repeatedly in these comments. Please don't repeat false information. Now you're right that this particular really old version also doesn't get security updates - but boy do I not have that expectation, and I would be surprised if anyone acting in good faith did.

Schiendelman 1y ago

You know they keep updating Safari and making security updates for old OSes for years, right?

smaccona 1y ago
Apple is definitely not the worst in this regard, but the most recent version of iOS to support the iPad 3rd generation (the device we are discussing which is being used as a PDF reader) is iOS 9.3.5 (a security/bugfix release on August 25, 2016 which supports the WiFi-only version of the iPad 3rd generation) or iOS 9.3.6 (also a bugfix release on July 22, 2019 which supports the WiFi+cellular version of the same device - specifically, this was a fix to keep GPS working). The iPad 3rd generation was released in 2012, so the 2016 9.3.5 iOS release gave 4 years of security/bugfix support for the WiFi-only version of that device.
- Schiendelman 1y ago
  Sure, but there haven't been any security exploits in that version of iOS since then. It still works.
  - kennywinker 1y ago
    Not sure what you’re meaning? A CVE like this: https://nvd.nist.gov/vuln/detail/CVE-2025-24201 https://nvd.nist.gov/vuln/detail/CVE-2025-24201 found in 2025 impacts iOS versions before 18.3.1 (Safari and iOS are shipped together). Which means there is a decent chance an iPad running 9.3.2 is vulnerable. And there have been thousands of CVEs since 9.3.2. Most of low severity, but not all.
    - ohnooonotagain 1y ago
      [dead]
    - Schiendelman 1y ago
      Apple patches anything with a proven exploit. While it may be vulnerable, no one has written and shown Apple an exploit.
      - kennywinker 1y ago
        Apple patches anything with a proven exploit as long as it’s in a supported version of the OS. E.g. They will not patch versions beyond macos 10.14 i believe, not sure what the cutoff for iOS is but it’s usually about 6 years of security updates. Which means that iOS 9.3.5 is well outside of that and so a bug that impacts that os will not be patched. Which means using an old device like that on the open internet is deeply foolish
        Schiendelman 1y ago
        My whole point is that what you believe isn't correct. Apple continues to release security updates for "unsupported" versions (let's be careful about terminology, that term is specific and we're both using it), generally for two more years after a version becomes unsupported. This is in a lot of the reporting about the topic and linked repeatedly in these comments. Please don't repeat false information. Now you're right that this particular really old version also doesn't get security updates - but boy do I not have that expectation, and I would be surprised if anyone acting in good faith did.