#fixed code
                                protected Optional<String> getDefaultBrowserVersion(String programFilesEnv,
            String winBrowserName, String linuxBrowserName,
            String macBrowserName, String versionFlag,
            String browserNameInOutput) {
        String browserBinaryPath = config().getBinaryPath();
        if (IS_OS_WINDOWS) {
            String programFiles = System.getenv(programFilesEnv)
                    .replaceAll("\\\\", "\\\\\\\\");
            String browserPath = browserBinaryPath != null ? browserBinaryPath
                    : programFiles + winBrowserName;
            String browserVersionOutput = runAndWait(getExecFile(), "wmic",
                    "datafile", "where", "name='" + browserPath + "'", "get",
                    "Version", "/value");
            if (!isNullOrEmpty(browserVersionOutput)) {
                return Optional
                        .of(getVersionFromWmicOutput(browserVersionOutput));
            }
        } else if (IS_OS_LINUX || IS_OS_MAC) {
            String browserPath;
            if (browserBinaryPath != null) {
                browserPath = browserBinaryPath;
            } else {
                browserPath = IS_OS_LINUX ? linuxBrowserName : macBrowserName;
            }
            String browserVersionOutput = runAndWait(browserPath, versionFlag);
            if (!isNullOrEmpty(browserVersionOutput)) {
                return Optional.of(getVersionFromPosixOutput(
                        browserVersionOutput, browserNameInOutput));
            }
        }
        return empty();
    }
#vulnerable code 
                                protected Optional<String> getDefaultBrowserVersion(String programFilesEnv,
            String winBrowserName, String linuxBrowserName,
            String macBrowserName, String versionFlag,
            String browserNameInOutput) {
        if (IS_OS_WINDOWS) {
            String programFiles = System.getenv(programFilesEnv)
                    .replaceAll("\\\\", "\\\\\\\\");
            String browserPath = browserBinaryPath != null ? browserBinaryPath
                    : programFiles + winBrowserName;
            String browserVersionOutput = runAndWait(getExecFile(), "wmic",
                    "datafile", "where", "name='" + browserPath + "'", "get",
                    "Version", "/value");
            if (!isNullOrEmpty(browserVersionOutput)) {
                return Optional
                        .of(getVersionFromWmicOutput(browserVersionOutput));
            }
        } else if (IS_OS_LINUX || IS_OS_MAC) {
            String browserPath;
            if (browserBinaryPath != null) {
                browserPath = browserBinaryPath;
            } else {
                browserPath = IS_OS_LINUX ? linuxBrowserName : macBrowserName;
            }
            String browserVersionOutput = runAndWait(browserPath, versionFlag);
            if (!isNullOrEmpty(browserVersionOutput)) {
                return Optional.of(getVersionFromPosixOutput(
                        browserVersionOutput, browserNameInOutput));
            }
        }
        return empty();
    } 
                            #location 20 
                            #vulnerability type THREAD_SAFETY_VIOLATION