Vulnerability identifier: #VU7349
Vulnerability risk: Low
Exploitation vector: Network
Exploit availability: No
Vendor: PHP Group
The vulnerability allows a remote attacker to cause DoS condition.
The weakness exists in the mbstring due to an error in handling of reg->dmin in forward_search_range(). A remote attacker can trigger SIGSEGV in left_adjust_char_head() during regular expression compilation, cause NULL pointer dereference and the application to crash.
Successful exploitation of the vulnerability results in denial of service.
Update to version 7.0.21.
Vulnerable software versions
PHP: 7.0.0 - 7.0.20
Can this vulnerability be exploited remotely?
Is there known malware, which exploits this vulnerability?