  The cross section of the process $e^{+}e^{-}\rightarrow\eta\pi^{+}\pi^{-}$ is
measured using the data collected with the CMD-$3$ detector at the VEPP-$2000$
collider in the center-of-mass energy range from $1.1$ to $2.0$ GeV. The decay
mode $\eta\rightarrow\gamma\gamma$ is used for $\eta$ meson reconstruction in
the data sample corresponding to an integrated luminosity of $78.3$ pb$^{-1}$.
The energy dependence of the $e^{+}e^{-}\rightarrow\eta\pi^{+}\pi^{-}$ cross
section is fitted within the framework of vector meson dominance in order to
extract the
$\Gamma(\rho(1450)\rightarrow{^{+}e^{-}})\mathcal{B}(\rho(1450)\rightarrow\eta\pi^{+}\pi^{-})$
and the
$\Gamma(\rho(1700)\rightarrow{e^{+}e^{-}})\mathcal{B}(\rho(1700)\rightarrow\eta\pi^{+}\pi^{-})$
products. Based on conservation of vector current, the analysed data are used
to test the relationship between the $e^{+}e^{-}\rightarrow\eta\pi^{+}\pi^{-}$
cross section and the spectral function in
$\tau^-\rightarrow\eta\pi^-\pi^0\nu_\tau$ decay. The
$e^{+}e^{-}\rightarrow\eta\pi^{+}\pi^{-}$ cross section measured with the
CMD-$3$ detector is in good agreement with the previous measurements.
