Package Instance

XStream is vulnerable to an Arbitrary Code Execution attack
### Impact
The vulnerability may allow a remote attacker to execute arbitrary code only by manipulating the processed input stream. No user is affected, who followed the recommendation to setup XStream's security framework with a whitelist limited to the minimal required types.

### Patches
If you rely on XStream's default blacklist of the [Security Framework](https://x-stream.github.io/security.html#framework), you will have to use at least version 1.4.16.

### Workarounds
See [workarounds](https://x-stream.github.io/security.html#workaround) for the different versions covering all CVEs.

### References
See full information about the nature of the vulnerability and the steps to reproduce it in XStream's documentation for [CVE-2021-21350](https://x-stream.github.io/CVE-2021-21350.html).

### Credits
The vulnerability was discovered and reported by threedr3am.

### For more information
If you have any questions or comments about this advisory:
* Open an issue in [XStream](https://github.com/x-stream/xstream/issues)
* Contact us at [XStream Google Group](https://groups.google.com/group/xstream-user)

XStream is vulnerable to an Arbitrary Code Execution attack
### Impact
The vulnerability may allow a remote attacker to load and execute arbitrary code from a remote host only by manipulating the processed input stream. No user is affected, who followed the recommendation to setup XStream's security framework with a whitelist limited to the minimal required types.

### Patches
If you rely on XStream's default blacklist of the [Security Framework](https://x-stream.github.io/security.html#framework), you will have to use at least version 1.4.16.

### Workarounds
See [workarounds](https://x-stream.github.io/security.html#workaround) for the different versions covering all CVEs.

### References
See full information about the nature of the vulnerability and the steps to reproduce it in XStream's documentation for [CVE-2021-21344](https://x-stream.github.io/CVE-2021-21344.html).

### Credits
钟潦贵 (Liaogui Zhong) found and reported the issue to XStream and provided the required information to reproduce it.

### For more information
If you have any questions or comments about this advisory:
* Open an issue in [XStream](https://github.com/x-stream/xstream/issues)
* Contact us at [XStream Google Group](https://groups.google.com/group/xstream-user)

XStream is vulnerable to a Remote Command Execution attack
### Impact
The vulnerability may allow a remote attacker has sufficient rights to execute commands of the host only by manipulating the processed input stream. No user is affected, who followed the recommendation to setup XStream's security framework with a whitelist limited to the minimal required types.

### Patches
If you rely on XStream's default blacklist of the [Security Framework](https://x-stream.github.io/security.html#framework), you will have to use at least version 1.4.16.

### Workarounds
See [workarounds](https://x-stream.github.io/security.html#workaround) for the different versions covering all CVEs.

### References
See full information about the nature of the vulnerability and the steps to reproduce it in XStream's documentation for [CVE-2021-21345](https://x-stream.github.io/CVE-2021-21345.html).

### Credits
钟潦贵 (Liaogui Zhong) found and reported the issue to XStream and provided the required information to reproduce it.

### For more information
If you have any questions or comments about this advisory:
* Open an issue in [XStream](https://github.com/x-stream/xstream/issues)
* Contact us at [XStream Google Group](https://groups.google.com/group/xstream-user)

XStream is vulnerable to an Arbitrary Code Execution attack
### Impact
The vulnerability may allow a remote attacker to load and execute arbitrary code from a remote host only by manipulating the processed input stream. No user is affected, who followed the recommendation to setup XStream's security framework with a whitelist limited to the minimal required types.

### Patches
If you rely on XStream's default blacklist of the [Security Framework](https://x-stream.github.io/security.html#framework), you will have to use at least version 1.4.16.

### Workarounds
See [workarounds](https://x-stream.github.io/security.html#workaround) for the different versions covering all CVEs.

### References
See full information about the nature of the vulnerability and the steps to reproduce it in XStream's documentation for [CVE-2021-21346](https://x-stream.github.io/CVE-2021-21346.html).

### Credits
wh1t3p1g G5-RD6@IIE found and reported the issue to XStream and provided the required information to reproduce it.

### For more information
If you have any questions or comments about this advisory:
* Open an issue in [XStream](https://github.com/x-stream/xstream/issues)
* Contact us at [XStream Google Group](https://groups.google.com/group/xstream-user)

XStream is vulnerable to an Arbitrary Code Execution attack
### Impact
The vulnerability may allow a remote attacker to load and execute arbitrary code from a remote host only by manipulating the processed input stream. No user is affected, who followed the recommendation to setup XStream's security framework with a whitelist limited to the minimal required types.

### Patches
If you rely on XStream's default blacklist of the [Security Framework](https://x-stream.github.io/security.html#framework), you will have to use at least version 1.4.16.

### Workarounds
See [workarounds](https://x-stream.github.io/security.html#workaround) for the different versions covering all CVEs.

### References
See full information about the nature of the vulnerability and the steps to reproduce it in XStream's documentation for [CVE-2021-21347](https://x-stream.github.io/CVE-2021-21347.html).

### Credits
The vulnerability was discovered and reported by threedr3am.

### For more information
If you have any questions or comments about this advisory:
* Open an issue in [XStream](https://github.com/x-stream/xstream/issues)
* Contact us at [XStream Google Group](https://groups.google.com/group/xstream-user)